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1.
Dec. 10, '1946.
F. RIEBER
2,412,536
MEGHANICALLY TUNED OSCILLATOR
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Filed Jan. 219, 1944
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Ill.
IN VENTOR
By
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'"W.
‘- Patented Dec‘. 710, ‘1946 ‘I
“ 2,412,536
10mm ' STATES PATENT (OFFICE
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V
‘
MECHANICALLYTUNEDOSCELATOR
Richer, New Yer-k, N. Y., assignor to Inter-v
val Instruments, Inc. , New York, N. Y., a corpo
ration of New York
v ApplicationJanuary29, 1944, Serial N... 520,204
9 Claims. (01. 250-36)
.
2 '
This invention relates to a device for readily
measuring the frequency of an alternating cur
They may, however, be so designed as to impose
rent with great accuracy.
In my copending application for transducers
?led of even date herewith and bearing Serial
port the weight l9, and they are intended to be
an initial tension on the wire I8, as well as sup
such as to offer no restraint to the movement of
the weight l9 along the axis of the shell, so long
No. 520,196, I have disclosed a transducer in
as that movement does not exceed a small
which the period of vibration of a stretched wire
is so coordinated with an alternating current that
the frequency of the alternating current may be
determined by measurement of the tension upon
the wire. In that application the tension upon
amount.
The lower end of the lower stud 23 is provided
with a nut 24 which may be arranged to engage
an adjustable screw 25 to limit the stretching
of the wire |8 too far, regardless of the condition
the wire is shown adjustable by means of a cam
having a dial such that the reading on the dial
to which it is subjected.
may be used directly'to indicate the frequency
of the current.
'
'
With the device as above constructed in origi
nally adjusting the device, it will be clear that
15 when the device stands with the weight I9 at
In accordance with the present invention, the
the top and with an extending end of the wire
same principles are utilized in measuring the fre
l8 protruding through the stud N, we may grasp
quency of an alternating current but in the in
the extending end of the wire I8 and place upon
stant case a different method of varying the ten
it a weight corresponding to the desired initial
sion upon the wire is employed.
20 tension thereof, and then clamp it with a screw
It is an object of this invention to provide
30. Thereafter ii the shell I3 is turned through
a frequency meter of great simplicity of con
any angle from the inverted vertical just de
struction and operation which will be rugged and
scribed, the tension on the wire will gradually
inexpensive, and yet very sensitive.
increase because the pull of the weight l9 varies
The invention accordingly comprises a device 25 with the cosine of the angle through which it is
possessing the features, properties and the rela
turned, until the position shown in Fig. 1 is at
tion of elements which will be exempli?ed in the
tained, in which position the weight l9 will be
article hereinafter described and the scope of
added to the tension instead of being subtracted
from it.
the application of which will be indicated in the
claims.
Mounted upon the end of the shaft l4 upon
For a fuller understanding of thenature and
one side is a pulley 3|, and mounted upon its
objects of the invention, reference should be had
outer end is an indicating hand 32, and between
to the following detailed description, taken in
the pulley and the indicating hand is a ?xed dial
connection with the accompanying drawing, in
33. Mounted below the pulley 3| upon the base
which:
35 is a bearing 34 carrying a shaft 35, on one end of
Fig. 1 is an elevation, partly in section, of an
which is a small pulley 36 in alignment with the
apparatus embodying this invention, connected
pulley 3|, and connected to it by a belt. Mounted
to a circuit forming a part of the apparatus.
upon the other end of the shaft 35 is a knurled
head 31.
Fig. 2 is a side elevation thereof to a reduced
scale.
The lower end of the wire I8 is electrically con
40
Fig. 3 is a section on line 33 of Fig. 1.
nected to the shell 20, which is itself electrically
Fig. 4 is a section on the line 4-4 of Fig. 1.
connected to ground. The upper end of the wire
In the drawing the numeral ||l designates a ‘base
I8 is connected through a lead 40, a condenser
having a pair of uprights || carrying bearings l2,
4|, and a feed back control resistance 4|a, with
in which is pivoted a frame l3 mounted on trun
the plate circuit 42 of an oscillator tube 43.
nions l4. The frame l3 may take the form of
Mounted within the shell I3 is an insulator S0
a closed cylindrical casing, although it will be
of a height substantially equal to the vibrating
understood that this closed casing is severable at
portion of the wire l8, and this insulator is cut
some point in order to aiiord easy access to the
away through its central portion, as shown at 5|,
interior for construction and repair. Mounted 50 leaving two arms 52, one at top and one at bot
in the center of one end of the shell is an insu
tom, between which is stretched an electrode 53;
lator l6 carrying a hollow stud II, in which is
while a permanent magnet 54 surrounding the
fastened one end of a wire l8, the other end of
member 50 has its poles disposed on opposite
the wire l8 being connected to a weight IS in the
sides of the wire l8, so that its lines of force
lower portion of the shell.
55 move transverse to the plane de?ned by the wire
Above and also below the weight I9 there is
I8 and the electrode 53.
provided a diaphragm 20 and 2|. The weight I9
The electrode 53 is electrically connected by a
is provided with studs 23 and 23 by which it is
wire 56 through a condenser 51 to the grid 58
connected to the center of the diaphragms 20
of the vacuum tube above referred to, while means
and 2 I. These diaphragms are quite ?exible. 60 are provided to maintain a proper potential upon
2,412,586
4
3
the grid shown in the form of a grid leak resist
frame, including means for imposing tension upon
ance 59. A potential is imposed upon the elec
trode 53 by means of a battery 60 acting through
a resistance 6!; and a battery 62 actingthrough
a translating device 63 supplies potential to the
said wire, even when said frame is rotated to
plate 42. With the construction above outlined,
it will be seen that as we turn the knurled knob
31, we vary the effect of the weight I!) upon the
tension of the wire l8, and thus vary its‘ fre
quency, according to the law that the tension at 10
|_¢ from inverted position = initial tension —
weight l9 and associated parts X cos ¢.
When this device is connected to the oscillating
circuit above described, the calibration of the in- _
strument will at all times indicate the frequency 15
of the current maintained by the oscillator.
If, however, it is desired to measure the fre
quency of an incoming current, the feed back cir
cuit from the oscillator may be omitted and the
incoming current may be fed through the vi 20
bratable wire.
The incoming signal, however,
will have no effect upon the vibrating wire until
the latter has been brought in tune with it. The
instrument may then be turned until the fre
quency of the wire is tuned to the incoming fre 25
quency, which will start the wire in vibration.
The vibration of the wire will thereupon start
the tube 43 in oscillation and this point will be
instantly recognizable by the response of the in
bring said weight above said wire,‘ an oscillator
including means controlled by the vibration of
said wire to maintain said wire in vibration, and
means to measure the angle through which said
frame is turned.
3. A device of the character described compris
ing, in combination, a wire, a magnet disposed
to have its lines of force transverse to said wire,
an oscillator actuated by the movement of said
wire and connected to maintain said wire in vi
bration, a frame having a diaphragm therein,
said wire having one end connected to said frame
and the other end to said diaphragm with said
wire axially disposed in said frame, a weight car
ried by said diaphragm, and means for indicat
ing the angle through which said frame is turned.
4. A device of the character described compris
ing, in combination, a frame, an upper and lower
diaphragm extending across said frame, a wire
stretched across between said frame and said up
per diaphragm and disposed 'axially in said
frame, a weight connected between said dia
Dhragms, said frame being rotatable about a hor
izontal axis, means for measuring the degree of
rotation thereof, an oscillating system including
means responsive to the vibration of the wire for
determining the period of oscillation, means sup
strument connected to the translating device 53 30 plied by said oscillator for passing current through
the wire, and a permanent magnet supported by
which is used in this speci?cation as typically
said frame having its poles disposed onoppo
embodying any use to which the alternatingcur
rent may be placed either to operate a. visual
meter or to perform some electrical function or
site sides of said wire,
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»
5. A device in accordance with claim 1, in
otherwise. These speci?c uses are ancillary to but 35 which the oscillator includes an electrode parallel
to the wire connected to the grid of the oscil
form no part of the present invention. The in
lator, means for imposing electric tension on said
strument calibration will then read the frequency
electrode, a magnet disposed with its poles on
directly.
opposite sides of said wire, and a connection for
When the instrument is used in this manner,
it serves to amplify any component of the incom 40 feeding current through said wire from said os
ing wave that is in tune with the setting of the
cillator.
6. A device in accordance with claim 2, in which
instrument.
Since certain changes may be made in the
the oscillator includes an electrode parallel to the
wire connected to the grid of the oscillator, means
above construction and di?erent embodiments of
the invention could be made without departing 4.vi for imposing electric tension on said electrode,
a magnet disposed with its poles on opposite sides
from the scope thereof, it is intended that all
matter contained in the above description or
of said wire, and a connection for feeding cur
rent through said wire from said oscillator.
shown in the accompanying drawing shall be in
7. A device in accordance with ‘claim 3, in
terpreted as illustrative and not in a limiting
which the oscillator includes an electrode parallel
sense.
to the wire and means for imposing electric ten
It is also to be understood that the following
sion on said electrode, said electrode :being'con
claims are intended to cover all of the generic
and speci?c features of the invention herein de
neoted to the grid of the oscillator, and con
nections for feeding current from said oscillator
scribed, and all statements of the scope of the in
vention which, as a matter of language, might 55 through said wire.
8. A device in accordance with claim 4, in which
be said to fall therebetween.
the oscillator includes an electrode parallel to the
Having described my invention, what I claim
wire and means for imposing electric tension on
as new and desire to secure by Letters Patent is:
1. A device of the character described compris
said electrode, said electrode being connected to
the grid of the oscillator, and connections for
ing, in combination, a frame mounted for rotation
feeding current from said oscillator through said
about a horizontal axis, a wire attached to said
frame having its other end connected to a weight,
wire.
9. A device of the character described compris
means supported by said frame for holding said
wire and weight axially disposed in said frame,
ing, in combination, a frame mounted for rota
an oscillator including means controlled by the 65 tion about a horizontal axis, a wire attached to
said frame having its other end connected to a
vibration of said wire to maintain said wire in
weight, means supported by said frame for hold
vibration, and means to measure the angle
through which said frame is turned.
'
ing said wire and weight diametrically disposed
in said frame, means for feeding a current
2. A device of the character described com
prising, in combination, a frame mounted for ro 70 through said wire, and a magnet disposed to
cause its lines of force to pass transverse to said
tation about a horizontal axis, a wire attached
to said frame having its other end connected to
a weight, means supported by said frame for hold
ing said Wire and weight axially disposed in said
wire.
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FRANK RIEBER.
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