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CH. I]
MAGIC LATERN WITH DIRECT CURRENT
Condenser
HC
FIG. 2. MAGIC LANTERN WITH TRIPLE CONDENSER AND WATER-CELL.
H C, V C Horizontal or upper and vertical or lower carbon of an arc lamp. The upper carbon furnishes the light.
D -f C Supply wires for the electric current. The positive wire (-}-) goes to the upper carbon (H C) , and the negative wire ( — ) comes from the lower carbon (V C). The arrows indicate the direction of the electric current.
F Fuses where the supply wires for the lamp connect with the main line.
L Incandescent lamp with wire guard. It is connected with the supply wires before the table switch (S) and the resister (R), hence it can be used while the arc lamp is running or when it is turned off (See also fig. 4).
S Double-pole, knife switch for turning the current on or off the arc lamp.
R Rheostat for controlling the current. It is inserted in one wire.
A Ammeter to indicate the amount of current being used. It is inserted in one wire.
Condenser This consists of a meniscus next the arc light, and of two planoconvex lenses with a water-cell between them. The lenses must be arranged as here indicated.
W Water-cell placed between the plano-convex lenses of the condenser. It absorbs much of the radiant heat.
L S Lantern slide close to the condenser.
-' Axis Axis The straight line pas'sing from the source of light along the optic axis of the condenser and the objective to the screen.
Objective Projection objective serving to give a clear image of the lantern slide on the screen.
C Center of the objective where the rays from the condenser should cross.
Screen Image The image of the lantern slide formed by the objective on the white screen.
carbons is used and the upper carbon is enough larger than the lower one, so that the two shorten at the same rate.
In our experience it is more satisfactory to have both carbons with soft cores, but some advocate and use a large soft-cored carbon above and a smaller solid carbon below (fig. 299).