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
§ 13. Lamp-house.—This is a metal box in which the arc lamp 
is enclosed. It should be of good size, and be well ventilated by 
means of openings at the bottom, and a flue at the top. There 
should be one or more large doors, so that the lamp can be reached 
for changing the carbons and making any necessary adjustments. 
Opposite the crater at the end of the positive carbon there should 
be a window about 2 to 3 cm. (2 in.) square so that the ends of the 
carbons can be observed when the lamp is burning without opening 
the door. This window should be provided with a combination of 
red and green, or red and blue glass, or with smoky mica or with 
deeply tinted glass so that the eyes will not be injured whenlook- 
ingat the crater (fig. 133, 147). 
§ 14. Incandescent lamp.—If experiments are to be made it is 
desirable to have an incandescent lamp with wire guard to use in 
connection with the lantern. It should have a flexible cord of 
sufficient length so that it can be carried to any desired position. 
This lamp must be connected with the supply wires before the 
rheostat is inserted; then it will bum brightly while the arc lamp 
is going. By consulting fig. 2, it will be seen that the two wires for 
this lamp are connected one with each of the supply wires. That 
is the incandescent lamp is not connected with one wire like the 
rheostat and the ammeter but with both wires. 
§ IS. Electric flash-light.—An electric flash-light is a great 
convenience about a lantern; and is almost a necessity when an 
incandescent light (fig. 1,2) is absent. It should lock, so that it 
will bum continuously ; then carbons may be changed by its light 
and other corrections made. It is an absolutely safe light also. 
§ 16. Incandescent lamp to bum when the arc lamp is turned 
off.—To avoid the great darkness in the room when the arc lamp is 
turned out, it is advantageous to have an incandescent lamp con¬ 
nected with the line, as indicated in fig. 4. 
§ 17. Condenser.—This collects the light from the arc lamp 
and directs it through the objective. In passing from the con¬ 
denser to the objective it passes through the lantern slide or other 
object whose image is to be projected (fig. 1,2 4).


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