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M E C H A N I C A L
P R I N C I P L E S
13
Oil
Level
Crank
Stud
Indicator
Gear Housing
\
Oil
Cup
Figure 10. Read and Punch Unit-Rear
View
The rear view in Figure 10 shows the mechan-
ical features visible from the rear as well as the
main transformer and the tube power supply chas-
sis. The tube power supply furnishes
D.
C .
volt-
ages of 100 volts, 150 volrs, and 250 volts for the
operation of tubes in the electronic unit. The main
transformer supplies
A. C.
of proper voltage to the
40 volt and 140 volt selenium rectifiers; it also
supplies -the filaments of all tubes except the gas-
filled rectifier tubes.
In the close-up view of Figure 11, a better pic-
ture of -the main transformer and tube power sup-
ply chassis is shown. Note particularly the system
for numbering terminals on both the transformer
and the power supply chassis.
The
EL-3C
and
EL-1C tubes are gas-filled full-wave rectifier tubes,
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