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thrown on the screen by about 70% when tne reflector is clean and the bulb new. Figs. 7 and 8 show the glowing filament of Mazda lamps, with the spaces between the filaments illuminated by the images projected by a concentric spherical mirror.
FiG. 2 — Relation of the diameter and separation of the condenser to the diameter and focus of the objective Ci Large diameter corrugated condenser, C2 Small diameter corrugated condenser. C3 Front element of plano-convex condenser system.
s-t Opening in slide holder placed directly in front of the condenser. This removes considerable of the light from the condenser when so placed. F (f-g) Aperture plate. O Objective.
p A point in the objective.
b-f-p and a-g-p are the limiting rays of light which reach the point p after passing through the aperture plate.
Ai-f-k and d-g-m rays passing through the aperture which do not add to illumination as they cannot get through the objective.
W-Z Large diameter objective.
X-Y Small diameter objective which does not include the point p.
CONDENSER
The condenser (C) may consist of a pair of plano-convex lenses, of a meniscus lens combined with a double convex lens, or of a single corrugated lens of the general design illustrated in the accompanying figures. The function of the condenser is to collect the diverging Hght rays emanating from the light source and to concentrate them upon the picture to be projected so as to produce an intense but evenly distributed illumination.
APERTURE
The aperture is an opening in a metal plate 29/32 in. wide and three-fourths as high used to limit the edges of the picture. In immediate contact with this aperture is the strip of film on which is printed the picture to be projected. The location of the aperture plate and film is designated by F. It is generally assumed that both the picture on the film and the edges of the aperture are in focus at the same time.
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