Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
§ 119. Summary of Chapter 
1. Connect both supply wires 
with the lamp; and remember 
that with the alternating cur¬ 
rent lamp it makes no difference 
which supply wire goes to the 
binding post of the upper and 
which to the post for the lower 
carbon (§ 106). 
2. Insert a rheostat or other 
balancing device along one of 
the supply wires (fig. 3). 
3. Insert the ammeter along 
one wire (fig. 2). 
4. Install a double-pole switch 
before the rheostat (fig. 3). 
5. If the lantern table is on a 
concrete floor, use a board or 
insulating mat to stand on and 
thus avoid possibility of a shock 
if the metal part of the lantern 
is touched (§ 98, 689). 
6. Feed the carbons nearer 
together every three to five 
minutes so that the lamp will 
not be noisy or go out or give 
double screen images. 
Do Not 
i. Do not fail to connect both 
supply wires to the arc lamp. 
2. Never try to use an arc 
lamp without a rheostat or 
balance. Do not connect the 
rheostat with both, but with a 
single wire. 
3. Do not connect the am¬ 
meter with both supply wires, 
but with one. 
4. Do not install a lantern 
without a double-pole, table 
switch which will cut off the 
current from all the apparatus 
on the lantern table (fig. 40). 
5. Do not stand directly on a 
moist concrete floor when oper¬ 
ating a magic lantern with an 
alternating current lamp. 
6. Do not let the lamp go too 
long before feeding up the car¬ 


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