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CINEMATOGRAPHIC ANNUAL „
neutralized by immersing the entire vibrating unit in a container filled with a mineral oil.
This vibrator is quite a sensitive device. It requires only 100 milliamps to give a full scale deflection. Since this vi
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FIGURE 3
Schematic diagram of galvanometer and optical system. L — Prefocused exposure lamp. Ci — Spherical lens. Si — Light stop. Cz — Galvanometer lens. V — Galvanometer vibrator. M — Galvanometer mirror. Sz — Scale. C.L. — Cylindrical lens. 03 — Spherical lens. A — Aperture. V.S. — Viewing Screen. 0 — Microscope objective. X — Directions of movement for alignment.
brator is part of an optical system you will be interested in seeing how it is used.
Fig. 3 is a schematic diagram of the entire arrangement Light is generated by a concentrated filament gas filled lamp (L) and focused by a double convex condensing lens (CI) onto the mirror of the vibrator (M) . The other lens shown as (C2) is a plane lens which acts as a window in the galvanometer housing and keeps the oil from coming out. It is placed at an angle so that light will not be reflected from its surfaces into the rest of the system. The circular disc with a square hole in it, is a light stop and merely cuts off the color fringe produced by the aberration of the lens.
The light is reflected from the mirror thru a cylindrical lens (C.L.) This lens condenses the beam of light in one direction only. It then passes thru another condenser (C3) on to a disc A. This disc has cut into it, as shown, a slit .003" wide thru which the light passes into a microscope objective. This ob