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May, 1926 AMERICAN
(J1INKMATOGRAPHER
Seven
PROJECTION
4 Conducted by Earl J.
Denison
Qerman Continuous
Projector Reviewed
£
Report Given on Details of New Type of Foreign Projector; Practicability Considered
FlGURIi 2
a. Positive Carbon of the arc-lamp.
b. Negative Carbon of the arc-lamp, r. Parabolic mirror.
d. Condenser lens.
f. Combined Lens-system to project the Frontwindow {the bundle of light-rays coming through it) on the film-path. g[ Mirror-sector which swings in the point />, and whereby the bundle of light-rays coming from the front-window are made to wander corresponding to the movement of the film. g Mirror-sector which swings in the point p, and whereby the movement of the film is compensated.
h . Pris m .
i. Bent film.
k. Sprocket-wheel {which controls the movement of the film).
I. Projection-objective, m. Tele-objective to give the right enlargement of the original picture.
n. Projection-mirror, which could be turned round for projection of dia-positives.
Recently the writer had the pleasure of seeing a demonstration of the Mechau Continuous Projector which, described in this article, is manufactured in Germany.
While I do not think that his machine is adaptable for American use, in its present type of construction, I do think it signalizes wonderful possibilities, as there are a number of clever little devices incorporated in the projector. For instance, the fire shutter is operated by mercury, is. absolutely positive in its action and is also extremely simple. The accompanying charts plainly show the action of the light rays through the projector and present an interesting study in optics.
Figure 1
Circular film path with bas the middle-point.
Objective to project the film on the projection
screen.
Reflecting mirror, turning round the Lavii d.
Fixed projection-mirror.
Projection screen.
Axis, round which the 8 inn cms < more in
the path of the light rays.
o. Axis round which t h e Projection-mirror could be turned.
p. Ball-bearings.
q. Rotation axis round which the sector-mirrors perform a circular-motion .
r. Folding-mirror folded out for lantern-slideprojection, t. Reflecting mirror.
u. Lens for concentrating the light rays on the lantern slide.
v. Lantern-slide.
iv. Lantern projection lens.
Creation Reviewed
Therefore, I believe that the readers, from a mechanical and engineering viewpoint, would be interested in a review of the projector.
The fundamental idea of the "optical compensation arrangement'1 is illustrated in the accompanying charts and is described bv the manufacturers as follows:
"If a frame happens to be in the position / and the mirror c in the position 1\ its projection appears on the screen in the point f. If this frame now moves downward in the position 2, then its projection on the screen would have wandered from the original
(Continued on Pag-e 18)