Bauhaus-Universität Weimar

7« 
E. IV. Scripture, 
lamp cord (6 feet, or 2 meters) to a socket plug; the other ends are 
scraped, bound with thread and left free. 
To use the battery a plug wire is inserted in any lamp socket on the 
supply circuit. The free ends are brought to the binding-posts F, and F. 
A 110-volt lamp of the required ampérage is placed in A. Thus for an 
electric fork a 1-ampère lamp will be used, for a spark coil a 4-ampôre 
lamp, etc. A low voltage lamp of the same or greater ampérage than 
the one in A is inserted in B. Thus for the electric fork the lamp must 
carry at least 1 ampère in order to correspond with the lamp in A ; it 
may conveniently be of 10 volts. For the spark coil a lamp of 8 volts 4 
ampères would be suitable. 
A plug wire is now placed in C, and the switch D is snapped to turn 
the current on. At the ends of the wires from the plug in C a current 
can now be drawn whose maximum intensity is practically the same as 
that in the lamp A and whose tension is practically the same as that at 
the poles of the lamp B. In the case of the electric fork it would be a 
current of 10 volts 1 ampère ; for the spark coil it would be 8 volts 4 
ampères. 
The lamp battery behaves like any other battery. Increased resistance 
in the external current decreases the intensity of the current delivered, 
etc. For circuits of great resistance a lamp of higher voltage may be 
used in B. For larger currents than 4 ampères the sockets at A and B 
are doubled, as it is not advisable to use the ordinary socket for a cur¬ 
rent of more than 4 ampères on a no-volt circuit. 
The character of the lamp batteries can be seen from the following tables. 
Table I. 
Lamps used in the■ batteries. 
Large Lamps. 
Small Lamps. 
Mark 
Trade Name. 
Mark 
Trade Name. 
on Lamp. 
on i.amp. 
A 
no volts 
100 c. p. 4 ampères. 
m 
8 volts 
4 
ampères. 
B 
110 volts 
100 c. p. 3^ ampères. 
n 
8 volts 
4 
ampères. 
C 
no volts 
64 c. p. 
0 
8 volts 
4 
ampères. 
D 
110 volts 
32 c. p. 
P 
12 volts 
3 
ampères. 
E 
no volts 
16 c. p. 
q 
12 volts 
2 
ampères. 
F 
no volts 
8 c. p. 
r 
12 volts 
I 
ampère. 
s 
12 volts 
0.7 
ampère. 
t 
10 volts 
I 
ampère. 
u 
6 volts 
I 
ampère. 
V 
20 volts 
16 
c. p.
        

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