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Oct.‘ 29, 1946,
c. M. HATHAWAY
2,410,379
GALVANOMETER
'
2
Filed Sept. 25, 1944
_
$______F,
J
INVENTOR.
laatented Get. 293, 1946
airs
QFFlCE
2,410,379
GALVANOMETER
Claude M. Hathaway, Denver,‘ (3010., assignor to
Hathaway Instrument Company, a corporation
of Colorado
Application September 25, 1944, Serial No. 555,686
6 Claims.
.
1
(01. 171-95)
2
-
The present invention relates to galvanometers,
and more particularly to a polyphase watt
body of the galvanometer so as to position the
galvanometer tracer on the record medium. In
'
order to provide lateral displacement of the tracer
In investigations in the power transmission
?eld it is not uncommon to operate with three
there is provided an adjusting member it con_
galvanometer.
nected to alever i'i directly beneath the subbase
phase circuits and frequently it would be de
is having an upwardly extending pin 18 adapted
sirable to obtain a three-phase Or polyphase watt
to vengage the bottom of the body of the gal
galvanometer.
In such galvanometers, the
vanometer cell block. The galvanometer cell
block is pivotally supported for angular displace
stationary ?eld coils are used as current coilsand
the moving ?eld coils are used as potential coils.
ment by the screw bearing member 19. The ap
The torque exerted by each potential coil is pro
paratus thus far described is well known in the
portional to the product of the current in the field»
art ‘and hence will. not be shown or described in
coil and the current in the potential coil] Of
further detail since it does not constitute a part
course it would be highly desirable to provide a
of the present invention.
7
g j
_
polyphase galvanometer which is relatively com [5
Suitably secured to the subbase i3 is a galva
pact and which is economical to manufacture.
nometer cell formed of two similar side mem
In accordance with the present invention this
bers 2i and 22, a rear cover 23 andra front cover
is accomplished by the use of a cell block which
is. readily machined and assembled. Further in
accordance with the present invention such
structure may be formed so as to be relatively
compact.
It, therefore, is an object of the present inven
tion to provide an improved, compact polyphase
galvanometer.
It is another object of the present invention
to provide an improved polyphase galvanometer
cell construction.
Other and further objects of the present in
it. The two side members 2! and 22 are formed
of two blocks of metal held together by dowel
pins 26 and 21. Extending from the front of the
two side members 21 and 22 to aplane closely
adjacent 22 is an elongated aperture 28 formed
by two similar complementary recesses in these
two members 2| and 22. The recess 28 therefore
25 extends from the front surface of the two mem
bers 2| and 22 to a plane formed by the inner wall
29 seen in the cut-away portion of Figure 2.
From the wall 29 to the rear of the side block
members 2| and 22, these members are machined
vention subsequently will become apparent by ref
30 so as to provide a chamber having shelves formed
erence to the following description taken in con
therein for supporting a plurality of partitions
forming compartments each arranged to contain
nection with the accompanying drawing wherein
Figure 1 is a front view of a three-phase
an electromagnet. Since both the members 2!
galvanometer constructed in accordance with the
and 22 have similar inner walls, only the wall for
' the member 2! will be described. _The wall BI
is provided with three recesses 32, 33, and 34 of
equal size. These recesses 32 to 34 operate as
present invention;
Figure 2 is a side view partially broken away
of the galvanometer shown in Figure 1;
Figure 3 is a side view of a portion of the front
supporting shelves for the laminated core struc
plate of the galvanometer and the galvanometer
ture of the electro-magnets. _ In between the re—'
40 cesses smaller recesses 35 andr36 are provided for
element; and
Figure 4 is a rear view of the device shown in
receiving partitions 38 and 39 seen in Figure 2.
Figure 3.
The grooves or recesses 32 to 3% support magnetic
Referring to the drawing it will be seen that in
core members M to G3- which are provided with
Figures 1 and 2 there is shown a three-phase
coils or windings 44 to 46 respectively. The side
galvanometer constructed in accordance with the 45 members 2i and 22 when mounted togetherare
present invention which has a base H provided
provided with a generally circular opening Ill _at
with trunnions 12 for supporting ‘the forward
the’ top to accommodate the inside terminals'of a
end of a subbase [3. The rear of the subbase I3 is
plurality of binding posts _48 supported vupon a
provided with an adjusting screw member Ill
suitable insulating plate member 99. The inner
bearing against the base II. A suitable tension 50 terminals of the binding posts 48 are suitably
spring arrangement is mounted within a housing
connected to the windings M to 45. A gasket M
15 so as to bias the rear end of thesubbase l3
is interposed between the side members 2| and 22
toward the base Ii.‘ The adjusting screwv ar
and the back plate 23 which is retained in posi
rangement l4 which is of conventional type well
tion by suitable fastening means or screws 52.
known in the art is used to raise or lower the 55 The front plate 24 is‘ provided with a gasket" 53,
2,4103%
3
4
and the plate is retained in position by suitable
cover for said block, said front cover having
screws 54. The front plate 24 is provided at its
inner surface with a support post 55 for holding
in position one end of a multiple galvanometer
mounted thereon means for supporting on a com
assembly comprising the coils 56, 51, and 58. The
mon support member, a plurality of moving coils
each arranged for cooperation with one of said
magnetic core members, a plurality of terminals
other end of this assembly is retained in position
mounted on said front cover member for connec
by suitable adjustable apparatus contained with
tion to said moving coils, and a plurality of mag
netic baffle sheet members mounted on said
shelves between said magnetic cores.
filler opening through which oil may be supplied
to ?ll the interior of the cell block. rl‘he front 10 _4. A cell for a polyphase galvanometer com
prising a block of metal having a recess extending
panel 24 is provided with four binding posts 5|
from the back of said block to a plane adjacent
so as to provide individual connections to one
the front of said block, said recess having stepped
terminal of each of the coils 5G to 58 and to pro
sides to form-a plurality of shelves, a plurality
vide a common return connection. This arrange~ '
ment of connections is clearly visible in Figure 4. 15 of magnetic core members mounted on said
shelves and each provided with a concentrated
The front panel 24 also supports a lens holder
, ?ux magnetic gap, an elongated recess extend
62 secured in position by fastening means 63 so as
ing from the front of said block to said ?rst
to be in proper position relative to a re?ecting
mentioned recess in alignment with said magnetic
mirror 64 carried by the multiple coil galvanom
eter element. By arranging the front cover 24 so 20 gaps, a rear cover for said block, a front cover
for said block, said front cover‘having mounted
as to carry the galvanometer element compris
thereon means for supporting on a common sup;
ing the coils 56 to 58, the binding posts 6! which
port member a plurality of moving coils each ar
provide connections thereto, and the lens holder
ranged for cooperation with one of said magnetic
62,.it will be appreciated that it is relatively easy
to properly assemble the galvanometer cell dur 35 core members, a plurality of terminals mounted
on said front cover member for connection to
ing manufacture, and to disassemble the cell in
said moving coils, and means mounted on said
the event that it is necessary to make repairs.
front cover for ?lling said cell with oil.
The entire structure is comparatively compact
5. Acell for a polyphase galvanom-eter com-.
and provides a polyphase watt galvanometer suit
prising a block of metal having a recess extend
able for use in a multiple element oscillograph.
ing from the back of said block to a plane ad
While for the purpose of describing and illus
jacent the front of said block, said recess hav
trating the present invention, a preferred em
ing stepped sides to form a plurality of shelves,
bodiment has been shown in the drawing, it is to
a plurality of magnetic core members mounted
be understood that such variations are contem
in a housing 59. The housing 59 also serves as a
plated in the structure as may be commensurate n on said shelves and each provided with a con‘
centrated ?ux magnetic gap, an elongated recess
with the spirit and scope of theinvention set
forth in the appended claims.
This invention is hereby claimed as follows:
, v1. A cell for a galvanometer comprising a block
extending from the front of said block to said
?rst mentioned recess for access to said magnetic
gaps, a, rear cover for said block, a front cover
of metalrformed of two similar pieces so that 40 for said block, said front cover having mounted
thereon means for supporting on a common sup
when assembled said block has a recess extend
port member a plurality of moving coils each ar-.
ing from the backof said block to a plane ad
ranged for cooperation with the magnetic gap of
jacent the front of said block, said recess hav
one of said magnetic core members, a plurality‘
ing stepped sides to form a plurality of shelves for
of terminals mounted on said front cover member
supporting core members, a ‘rear panel for said
block for closingoneend of said recess, a front 45 for connection to said moving coils, and means
mounted on the top 'of said cell for electrical
panel for closing the other end of said recess,
connection with said coils.
'
and means mounted on said front panel for sup
6. A polyphase galvanometer comprising a block
porting moving coil members.
'
2. A cell for a galvanometer comprising a block 50 of metal formed of two similar pieces, said block
when assembled having a recess extending from
of metal formed of two similar pieces, said block
the back to a plane adjacent the front of said
when assembled having a recess extending from
block, said recess having stepped sides to form
the back of said block to the front of said block,
a plurality of shelves, a’plurality‘ of magnetic
said recess having stepped sides to form a plural
ity of shelves for supporting a plurality of mag 55 core members each provided with an energizing
coil, said magnetic core members being posi
netic core members, a rearcover for said block
tioned
on said shelves, a plurality of magnetic
for closing the rear of said recess, a front cover
for closing the other of said recesses, means
ba?le members interposed between said magnetic
cores and supported by certain of said shelves,
said
block having an elongated recess extending
moving coil support member having thereon a
plurality of moving coils for cooperation with 60 from the front to said ?rst mentioned ‘recess for
access to said magnetic cores, a rear panelfor
said plurality of magnetic core members, and ter
closing said ?rst recess, a front panel for c10s~
minals mounted on said front cover for connec
ing the other'recess, a plurality of moving coils
tion to said moving coils.
I
'
mounted on aycommon support member, said
3. A cell for a polyphase galvanometer com
' support member- being positioned on said front
prising a block of metal having a recess-extend
paneLeach moving coil being associated Witha
ing-from the back of said block to a‘ plane ad
different magnetic core member, ' terminals
jacent the front of said block, said recess having
mounted on said front panel for connection to
stepped sides to form a plurality ofshelves, a
said moving coils, a mirror mounted on said mov
plurality of magnetic core members mounted on 70 ing coil support member, means mounted on the
said shelves and each provided with a concen
top of said block for electrical connection with
trated flux magnetic gap, an elongated recess
said energizing coils of said magnetic core mem-'
extending from the front of said block to said
bers, and means mounted on-said front panel
whereby said block may be ?lled withv oil.~
, .
?rst mentioned recess in the proximity of said
magnetic gaps, a rear cover for said block, a front 75
CLAUDE M. HATHAWAY.
mounted on said front cover for'supporting a
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