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Патент USA US2403889

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July 9, 1946.
M. J. D1 -rcìRo
2,403,889 `
TELEMETERING SYSTEM
Filed Aug. 24, 1943
A3
INVENTOR
MICHA L.. J. Di TORO
B
ßfïá/?ye.
A
ORNEY
~
Patented July 9, 1946
UNITED STATES PATENT GFFICE
2,403,889
TELEMETERING SYSTEM
Michael J. Bi Toro, Brooklyn, N. Y., assigner, yby
mesne assignments, to Hazeltine Research, Inc.,
Chicago, Ill., a corporation of Illinois
Application August 24, 1943, Serial No. 499,769
10 Claims.
(Cl. 177-351)
1
2
This invention relates to a telemetering system
and, more particularly, to a system, for scanning
provide a telemetering system such that com
paratively simple and inexpensive `means can be
a meter or instrument to develop a signal repre-
used for conditioning a meter for use in ,conjunc
sentative of the information indicated thereon.
tion with the telemetering apparatus.
Telemetering systems of the prior art have em- 5
In accordance with a feature of the present in
ployed ‘several types of scanning to derive a sigVention, a telemetering system for developing a
nal representative of the information which is
signal representative of the position o-f a meter
indicated on the dial of a meter. Apparatus of
indicator, having at least a portion thereof
the television type including an electron beam
formed of a material capable of having electrical
scanning system has been used, but has been lo losses produced therein, comprises oscillatory
somewhat limited in application because of the
field-producing means for producing the afore
considerable size and weight inherent in this type
said electrical losses and having a value of im
of equipment, particularly in connection with
pedance which varies with the proximity of the
telemetering systems associated with aircraft.
oscillatory field thereof to the material because of
In addition, telemetering arrangements of this l5 the electrical losses produced therein. The sys
type, where the information is to be transmitted
tem includes means for effecting relative mechan
to the ground, require a transmission channel
ical scanning motion between the oscillatory field
having a wide pass band. Alternative prior art
systems, which employ scanning by means of a
0f the ñeld-D‘l‘OduCíhg Ine-'MIS and the îhdíCatOl‘,
and means for supplying oscillations to the field
capacitance variation produced when the indicator of the instrument being telemetered alters
its relative position, are not subject to .some of
the limitations of equipment of the television type
but introduce other problems. Since the effective capacitance in such prior art systems is deteymined by .the Spacing 0f rather delicate mova‘ble members, vibration of the object carrying
the telemetering equipment materially eireots the
performanoe of the equipment, which performance often depends upon critical spatial relationships. spurious noises developed in such
telemetering equipment by vibration greatly
lessen the effectiveness of operation and the dependability of the indications derived from the
equipment. Mecham'cal scanning devices which
heretofore have been employed have been sluggish in their response and have not been umformly responsive over the entire range 0f the
instruments which were being telemetereol.
rt is an object of the invention, therefore, to
provide a new and improved telemetering system
20 producing means to develop the oscillatory field
and responsive to the Variation 0f impedance 0f
the field-producing means during the scanning
metícn fel“ developing a signal Which îS repre
Sehíia‘ßìVe Ofithe DOSílìîOh O‘f theîhdíeatol‘
25
FOI' a better understanding 0f the Present ín
vention, together with other and further objects
thereof, reference is had to the following de
Scripticn taken in connection with the accom
panying drawing, and its-Scope will be Dcintcd cut
fm ‘lh the appended Claims
In the aeccmpanyírlg dl‘eWîIlgî
Fig. 1 is a diagrammatic representation cf a
telemetering SYStem in rfLCCOYCïemCe With the ín
Veh’ßïOh and íhChldeS eSSOCiated eleCtI‘îCel eppe
535 YatuS; Fig. 2 iS e» PeI’Slßee‘tîl/e View, With DOI‘ÈÍOIIS
broken away, 0f ateîeïheteïìhg System embOdying
the invention; while Fig. 3 illustrates a modifica
tion of the arrangement of the present invention.
Referring ncrv more particularly to Fig. 1 of
rl the drawing. a telemetering System for develop
me e Signal representative' 0f the îndíCetíOn 0f a
which avoids one or more of the above-mentioned
meter comprises a means IB including an Oscilla
disadvantages of prior art arrangements,
EGW íìeld~pr`0d1l0îhg Ineens fOI‘ SCahIlîhg an i11
lt is smother object of the invention to provide
dicatcr li cf a meter l2 by movement cf the
a telemetering system which develops a, Signal ‘15 last-mentioned means relative to the meter. The
representative of the indications of a meter,
means l0 compri-Ses a rotary Support I3 which is
which signal has a magnitude materially greater
peeî'ßîehed adjacent lShe íhdîCatOI‘ l l and Whîeh
than that developed by spurious noises du@ to
:is driven by a motor I4 coupled to a shaft I5, as
vibration or other causes.
indicated by the broken line I6. The axis of the
It is a further object of the invention to pro-- 5G 1‘0‘601’ O1’ SIllJDG‘l‘È I3 iS preferably IlO-Tmal 110 the
vide a telemetering system for use in proximity
face of the meter and coaxial with that of the
-to the meter scanned in which accuracy of alignmeter indicator i i. Radially disposed oscillatory
ment therewith is not critical for reliable perfield-producing means l1, which preferably com
formance.
a
_ _
.
prise a pair of coils of a. material such as copper
It ls an additional obJect of the invention to "i Di which has a relatively low product of high-fre
2,403,889
4
quency resistivity and high-frequency permea
which includes the parameters of permeability
bility, are mounted on the rotor I3 with the axes
and resistivity, is contained in an article by Har
old A. Wheeler in the September 1942 issue of
the Proceedings of The Institute of Radio Engi
lthereof substantially parallel to the rotor axis.
These coils are connected in the same sense and.
for best results, each encloses a magnetic core
I8 of compressed comminuted iron particles, the
neers at page 412.
latter being rigidly secured to the rotor in any
Since the drawing is diagrammatic, it will be
apparent that, in an actual telemetering system,
suitable manner.
the electrical scanning means IIJ is secured in a
The
distance between
the
outer ends of the cores IB and the indicator I I is
convenient manner to the body of the meter
small, and preferably not greater than the diam
with the windings I1, I1 within the region of in
fluence of the indicator I I.
eter of a winding I1.
The oscillatory field-producing or Winding
For the purpose of developing a signal includ
means I1 is electrically connected to a condenser
ing a component representative of the zero or
I9 and to a, winding 2U which is disposed on an
reference point of the meter, the arrangement
annular shoulder 2I on rotor I3 to form a series 15 includes means comprising a rotatable indicator
resonant or tuned circuit. A stationary winding
35 for scanning a reference point. This means
22 is disposed adjacent winding 2U in a manner
comprises `a pair of windings 36, 35 disposed
to provide a magnetic coupling between the scan
about powdered iron cores 31, 31 attached to a
ning means including windings I1 and a means
support 38. Across the leads to windings 3B, 36
for supplying oscillations thereto comprising an 20 there exists an inherent capacitance represented
oscillator 23. The windings 20 and 22 are cou
by the dotted-line condenser 36’. Windings 36,
pled with optimum coupling and the oscillator
35 and capacitance 36' form a parallel-resonant
23 preferably is one which is capable of deliver
circuit. The indicator 35, which is preferably
ing a substantially constant current at a fre
similar to the above-described indicator II, is
quency which is high with respect to the frequen 25 driven by the motor I4 in a conventional manner,
cy of scanning.
the driving connection being represented by the
Across the leads to stationary winding 22 there
broken line 39, so that the rotary scanning means
exists an inherent capacitance represented by the
I0 and the indicator 35 have corresponding
dotted-linel condenser 22’ in Figs. l and 2.
movement relative to the stationary elements. In
Winding 22 and capacitance 22' form a parallel 30 a practical embodiment of the invention, these
resonant circuit.
elements are driven at a speed of 50 revolutions
The telemetering arrangement also comprises
per second. The windings 36 are connected in
a means coupled to the rotary scanning means I0
circuit with an oscillator 40, a detector 4I, and
for deriving a signal in response to the influence
a signal-shaping and reversing network'42, which
of the indicator I I at the position of the indicator
are identical in character with the similar units
on the meter I2. This means comprises a detec
tor 24 of conventional design which is connect
ed to the scanning means through the oscillator
23 and the stationary winding 22, and preferably
previously mentioned with the exception of net
work 42 which, in addition to performing a sig
nal-shaping function in the same manner as
network 25, also reverses the polarity of its in
includes a signal-shaping network 25 which com 40 put signal for a purpose which will be explained
prises well-known signal-shaping devices, such
below. The output circuits of both of the signal
as clippers, pulse Sharpeners, and differentiat
shaping networks 25 and 42 are connected to a
'ing circuits for providing a sharp, narrow signal
mixer unit 43 wherein the signal outputs are
which denotes the exact center of the indicator
45 combined to provide a composite signal in re
Il which is being scanned.
spense to the influence of the indicators at their
The indicators of airplane meters are gener
respective positions on the meter and at the ref
ally made of aluminum. When such an indicator
erence point. The primary components oi' this
is used with a telemetering arrangement in ac
composite signal are preferably within the voice
cox-dance with the instant invention, best results
fredueney band so that it is suitable for trans
are provided when the indicator has attached 50 mission and reception by conventional transmit
thereto a small strip 26 of material having a rel
ters and receivers.
atively large product of high-frequency resistiv
The scanning arrangement shown in perspec
ity and high-frequency permeability, such as the
tive in Fig. 2 is a more detailed illustration of
materials sold under the trade names of “Per
that shown in Fig. l, corresponding parts bear
malloy” and “Allegheny Mu-Metal,” the latter 55 ing the same reference numerals. The graduat
having primary components of nickel, copper,
chromium, and iron.
This strip may have a
ed dial 45 may be one which indicates a condi
tion such as altitude, air speed, acceleration, or
rate of climb of an airplane.
tutes the only alteration to the meter which is
In operation of the telemetering system de
required where optimum results are desired. In
scribed, oscillations are supplied to the station
lieu of the above-described indicator, one made
ary winding 22 b_v oscillator 23 and are induced by
entirely of a metal having a relatively large prod
Winding
22 into the windings I1, I1 which com
uct of high-frequency resistivity and high-fre
prise with condenser I9 and winding 20 a series
quency permeability may be employed. It hasl
been found that high-permeability nickel alloys 65 resonant circuit. The magnetic field produced bv
the winding I1. I1 set up eddy currents and hence
have proved particularly desirable when the 0S
produce electrical losses in the indicator element
cillator 23 develops frequencies of the order of
25 when the windings I1, I1 are in proximity to
150 kilocycles. The thickness of the strip 26 or
the
indicator II. Since the indicator element
the indicator II is preferably a minor fraction
of the depth of penetration of the ‘nigh-frequency 70 26 comprises a material having a relatively large
product of its high-frequency resistivity and
oscillations. The resistivity of the indicator ma
thickness of about one or two mils and consti
terial, which preferably is high. should approach
an optimum value for the particular value of per
high-frequency permeability, it is capable of
having substantial losses produced therein and
the eddy currents so set up reñect en increased
meability for the material which is selected. A
useful treatment of the skin effect phenomenon, 75 resistance into the circuit of windings I1, I1 in
2,403,889
a manner that depends primarily upon. the ex
the dial 45. The windings l1, Il and their cores
tent to which the indicator element 26 interferes
I8, I8 are preferably spaced from the axis of ro
tation of rotor I3 by distances corresponding to
with the normal flux paths. Accordingly, the se
ries rgsistance reflected by the circuit of wind
ings l1, I'I into the circuit of winding 22 is cor
the above-mentioned distances so that each
winding is primarily responsive to an individual
respondingly decreased. It follows that the par
indicator. The arrangement of Fig. 3, when con
allel-resonant impedance of the circuit compris
nected to oscillator 23, thus operates in a man
ing winding 22 and capacitance 22', as presented
ner similar to that described above to produce
to oscilator 23, increases. This increase in im
both reference and indicator signals at the out
pedance causes a corresponding increase in the 10 put circuit of unit 25.
amplitude of the generated oscillations, as illus
From the foregoing description of the inven
trated by curve a of Fig. 1. Conversely, as wind
tion, it will be apparent that the oscillatory-field
ings I1, l1 recede from the indicator element 25,
producing means comprising windings il' is ef
this sequence of events is reversed. It will be ap
fective to produce electrical losses in the strip
parent to one skilled in the art that the arrange 15 26 which forms a portion of the indicator ll in
ment may be modified to develop other than an
Figs. l and 2, or losses in the indicators 50, 5l of
amplitude-modulated signal, for example a fre
the Fig. 3 arrangement. Also the oscillatory
quency-modulated signal. The developed signal
field-producing means has a value of impedance
is translated to the detector 24 where it is de
which varies with the proximity of the oscillatory
modulated to derive a pulse wave, as represent 20 ñeld thereof to the strip 26 or the indicators 50,
by curve b, and shaped in unit 25 to provide a
5l because of those losses. The motor i4 and ro
narrow pulse, represented by curve c, which in
tary support i3 comprise means for effecting rel
dicates the precise center of the indicator ele
ative scanning motion between the oscillatory
ment 26, and thus the reading of meter E2.
field of the field-producing means including
It will be manifest that the synchronous rota
windings Il and the indicator Il, or indicators
tions of indicator 35 past the windings 35 will
50, 5|, while the oscillator 23 comprises means for
periodically develop a similar signal in units 40
supplying oscillations to the field-producing
42, inclusive, which represents the zero or refer
means to develop the oscillatory field thereof and
ence point of the meter being telemetered. Thus,
is responsive to the variation of impedanceof the
oscillations are supplied to the windings 35, 36 by î field-producing means during the scanning mo
oscillator 40 and indicator 35, by reason of its
tion for developing a signal which is represen
movement in synchronisrn with that of rotary
tative of the position of the indicator îl or the
support I3, is periodically disposed in proximity
relative positions of the indicators 5l) and 5I.
to windings 36, 3S. Under this condition, the
The use of an indicator comprising material
parallel-resonant impedance of the circuit corn- i" having a relatively large product of high-fre
prising windings 36, 35 and capacitance 36', as
presented to oscillator 40, decreases. This de
crease in impedance causes a decrease in the am
plitude of the oscillations generated, as repre
sented by curve d of Fig. l. 'I‘he output pulse
signal of detector 4l is, therefore, of a polarity
opposite to the output signal of detector 2d, as
represented by curve e. The polarity of the out
put signal of detector ¿il is reversed by signal
shaping and reversing network 42 so that the re
sultant output signal of the signal-shaping and
reversing network 42 is of the same polarity as
the output signal of signal-shaping network 25,
quency resistivity and high-frequency permea
bility, in conjunction with an instrument being
telemetered, has several noteworthy features.
The rotating scanning means I0 and its associ
ated oscillator 23 are easily adjusted to provide
a strong signal in the presence of an indicator
of the character described. The arrangement
will then be virtually insensitive to spurious sig
nais arising from relatively large axial and
planar misalignments of the rotor and the meter.
The system, therefore, effectively compensates
for ordinary misalignment. Vibration of -the
equipment and particularly the rotor i3 and the
as represented by curve f,
more delicate instrument indicator H will not
The signals developed in the shaping networks di) affect the efliciency of the. system and the accu
25 and 42 are combined in mixer 43 to provide a
racy of the results as in capacitive scanning ar
composite signal at the output terminals thereof,
as represented by curve g, which is representa
tive of the indication of the meter. A signal of
the type shown by curve g is developed for each
rotation of the rotor I3 and the indicator 35.
This signal can be visually reproduced by any
suitable apparatus, for example by an arrange
ment of the type shown in the copending appli
cation Serial No. 499,770, filed concurrently with
this application, in the name of John Kelly
Johnson, entitled Telemetering system, and as
signed to the same assignee as the instant inven
tion.
There is shown in Fig. 3 a portion of a modi
fied telemetering arrangement which obviates
the need for members 35-43, inclusive, of the Fig.
2 arrangement.
The system includes a rotary
rangements. The system. is, therefore, substan
tially nonmicrophonic. Furthermore, other ele
ments on the dial face or on the instrument
casing will not influence the ñdelity of the de
rived indication since the telemetering system is
primarily responsive only to materials of the type
specified.
The loose magnetic coupling between the pri
mary and secondary windings 23, 22 is likewise
substantially unaffected by vibrations and addi
tionally assists to provide a signal representative
of a true indication, thereby enhancing the sta
bility of performance. When, as in the Figs.
1 and 2 arrangements, the indicator l! is
provided with a strip 2G of material having
a. relatively high product of high-frequency
resistivity and high-frequency permeability and
means Il! for scanningr a pair of indicators 5B
the clearance between the cores
and 5l of the meter, which are disposed at un- "
indicator
equal radial distances from the axis 52, by move
ment relative to those indicators. Indicators 5d
and 5I are preferably markers of material, such
as that of element 26, and indicator 5| is prefer
ably positioned at the zero or reference point on
diameter of a winding l1, as previously men
il
5S and the
is approximately equal to the
tioned, the windings I'! are relatively loosely
coupled to the indicator. Under these conditions
the instant telemetering system can be employed
in conjunction with a conventional meter, which
2,403,889
7
8
has the strip 2B applied to its indicator, without
window is then effective to shield the indicator
which may be utilized to indicate the position of
said indicator.
3. A telemetering system for developing a sig
nal representative of the position of a meter indi
cator having at least a portion thereof formed of
from air currents which are developed by the
movement of the rotor I3. Increasing the cou
a material capable of having electrical losses pro
duced therein comprising, an oscillatory-field
removing the usual glass window of the meter
and yet provide a satisfactory sensitive indica
tion of the position of the indicator. The glass
producing winding for producing said electrical
pling between the windings Il and the indicator
losses and having a value of impedance which
Il permits the use of material for the strip 25
which has a somewhat lower product of high 10 varies with the proximity of the oscillatory ñeld
frequency resistivity and permeability.
of said winding to said material because of said
In addition to deriving a signal denoting the
electrical losses therein, means for effecting rela
tive mechanical Scanning motion between said
center of the indicator, the signal-shaping net
oscillatory ñeld of said winding and said indi
works 25 and 42 can provide a signal which is
adapted for transmission by a channel having a 15 cator, and means for supplying oscillations to said
winding to develop said oscillatory field and re
pass band such as is employed in conventional
sponsive to the variation of impedance of said
radio transmitters and receivers.
winding during said scanning motion for develop
It will be evident that the internal mechanism
ing a signal representative of the position of said
of the meter I2 comprises a means responsive to
an effect to be measured, and that the indicator 20 indicator.
4. A telemetering system for developing a sig
II comprises a means coupled to the first-men
nal representative of the position of a meter indi
tioned means for indicating that effect. While the
meter I2 has been described as one which prei
erably includes an indicator II includingr an ele
ment 26 comprised of a material having a rela
tively large product of high-frequency resistivity
and high-frequency permeability, for some applications it will be unnecessary to provide an indi
cator of a material as specified above.
While there have been described what are at
cator having at least a portion thereof formed of
a material capable of having electrical losses pro
25
duced therein comprising, oscillatory-neld-pro
ducing means including a tuned circuit for pro
ducing said electrical losses and having a value
oi impedance which varies with the proximity of
the oscillatory field thereof to said material be
cause of said electrical losses therein, means for
effecting relative mechanical scanning motion
between said oscillatory ñeld of said field-Produc
ing means and said indicator, and means for sup
plying oscillations to said field-producing means
present considered to be the preferred embodi
ments of this invention, it will be obvious to those
skilled in the art that various changes and modi
ñcations may be made therein without departing
from the invention, and it is, therefore, aimed in 35 to develop said oscillatory neld and responsive to
the variation of impedance of said held-produc
the appended claims to cover all such changes and
ing means during said scanning motion for de
modifications as fall within the true spirit and
veloping a signal representative of the position of
scope of the invention,
What is claimed is:
said indicator.
5. A telemetering system for developing a sig
1. A telemetering system for developing a sig 40
nal representative of the position of a meter indi
nal representative of the position of a meter indicator having at least a portion thereof formed of
cator having at least a portion thereof formed of
a material capable of having electrical losses pro
a material capable of having electrical losses pro
duced therein comprising, oscillatory-ñeld-pro
duced therein comprising, oscillatory-field-pro
ducíng means for producing said electrical losses
ducing means for producing said electrical losses
and having a value of impedance which varies
and having a value of impedance which varies
with the proximity of the oscillatory field thereof
with the proximity of the oscillatory field thereof
to said material because of said electrical losses
to said material because ol' said electrical losses
therein, means for supporting said last-mentioned
therein, means for effecting relative mechanical
scanning motion between said oscillatory field of 50 means for rotatable movement about a circular
path lying adjacent to said indicator to effect
said field-producing means and said portion of
rotary mechanical scanning motion between said
said indicator, and means for supplying oscilla
oscillatory field of said held-producing means and
tions to said field-producing means to develop
said indicator, and means for supplying oscilla
said oscillatory ûeld and responsive to the varia
tion of impedance of said field-producing means 55 tions to said field-producing means to develop
said oscillatory ñeld and responsive to the varia
during said scanning motion for developing a
tion of impedance and said held-producing means
signal representative of the position of said indi
during said scanning motion for developing a sig
cator.
nal representative oi” the position of said indi
2. A telemetering system for developing a sig
nal representative of the position of a meter indi 00 cator.
6. A telemetering system for developing a sig
cator having at least a portion thereof formed of
nal representative of the position of a meter indi
a material capable of having electrical losses pro
duced therein comprising, oscillatory-neld-pro
cator
at least a portion thereof formed of
a material capable of having electrical losses pro
ducing means for producing said electrical losses
and having a value of impedance which varies 65 duced therein comprising, cscillatory-ñeld-pro
ducing means for producing said electrical. losses
with the proximity of the oscillatory ñeld thereof
having a value of impedance which varies
to said material because of said electrical losses
with the proximity of the oscillatory field thereof
therein, means for effecting relative mechanical
to said material because of said electrical losses
scanning motion between said oscillatory field oi
said field-producing means and said indicator, 70 therein, means for effecting relative mechanical
scanning motion between said oscillatory held of
and means for supplying oscillations to said iield
said held-producing means and said indicator,
producing means to develop said oscillatory field
and means magnetically coupled to said field
and responsive to the variation of impedance or"
producing means for supplying oscillations there
said field-producing means during said scanning
to to develop said oscillatory field and responsive
motion for developing a signal having components
2,403,889
9
to the variation of impedance of said field-pro
ducing means during said scanning motion for
meter having at least a portion thereof formed
of a material characterized by a relatively large
developing a signal representative of the position
product of high-frequency resistivity and high
frequency permeability and thus capable of hav
ing substantial electrical losses therein, oscilla
of said indicator.
'7. A telemetering system for developing a sig
nal representative of the relative positions of a
plurality of spaced meter indicators each of
which is formed at least in part of a material
capable of having electrical losses produced there
in comprising, an oscillatory-ñeld-producing
winding for producing said electrical losses and
having a value of impedance which varies with
the proximity of the oscillatory field of said wind
ing to said portion of each of said indicators be
cause of said electrical losses therein, means for
tory-ñeld-producing means for producing said
electrical losses and having a value of impedance
which varies with the proximity of the oscillatory
field thereof to said material because oi said elec
trical losses therein, means for eiîectiing relative
mechanical scanning motion between said oscil
latory ñeld of said held-producing means and
said portion oi said indicator, and means for
supplying oscillations to said field-producing
f means to develop said oscillatory neld and respon
effecting relative mechanical scanning motion
between said oscillatory ñeld of said winding and
said portions of said indicators, and means for
supplying oscillations to said winding to develop
said oscillatory ñeld and responsive to the varia
sive to the variation of impedance oi' said ñeld
producing means during said scanning motion for
developing a signal representative of the position
of said indicator.
tions of impedance of said Winding means dur
ing said scanning motion for developing a signal
posite signal representative of the relative posi
representative of the relative positions of said
indicators.
8. A telemetering system for developing a sig
l0. A telemetering system for developing a com
tions of a meter indicator and a reference indi
cator each of which has at least a portion formed
of a material capable of having electrical losses
produced therein comprising, a first oscillatory
field-producing means for producing said electri
cal losses in said portion of said meter indicator
and having a value of impedance which varies
with the proximity of the oscillatory field thereof
product of high-frequency resistivity and high
to said portion of said meter indicator because
frequency permeability and thus capable of hav
of said losses therein, a second oscillatory-field
ing substantial electrical losses therein compris
producing means for producing said electrical
ing, an oscillatory-ñeld-producing winding ,for
losses in said portion of said reference indicator
producing said electrical losses and having a value
and having a value of impedance which varies
of impedance which varies with the proximity of
the oscillatory field of said winding to said ma 35 with the proximity of the oscillatory ñeld of said
second ñeld-producing means to said portion of
terial because of said electrical losses therein, said
said reference indicator because of said losses
Winding being formed of a material characterized
therein, means for effecting relative mechanical
by a relatively small product of high-frequency
scanning motion between said oscillatory ñelds
resistivity and high-frequency permeability,
means for eñ‘ecting relative mechanical scanning 40 of said ñrst and second held-producing means
and said indicators, and means for supplying
motion between said oscillatory ñeld of said wind
oscillations to said ñrst and second field-produc
ing and said portion of said indicator, and means
ing means to develop said oscillatory ñelds and
for supplying oscillations to said winding to de
responsive to the variations of the impedances of
velop said oscillatory ñeld and responsive to the
variation of impedance of said winding during 45 said first and second held-producing means dur
ing said scanning motion for developing a com
said scanning motion for developing a signal rep
posite signal representative of the relative posi
resentative of the position of said indicator.
9. A telemetering system for developing a sig
tions of said indicators.
nal representative of the position of a meter indi
MICHAEL J. DI TORO.
cator comprising, a meter, an indicator for said 50
nal representative of the position of a meter indi
cator having at least a portion thereof formed
of a material characterized by a relatively large
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