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864 HANDBOOK OF PROJECTION FOR
protrudes from lug Y, Fig. 360, into the hole in end of threaded collar U, Fig. 360, and shove the holder in as far as it will go.
By way of explanation, a metal stud passes through and is gripped and held by lug Y, Fig. 360. To one end of this stud wire X attaches, as shown. The other end extends beyond the left hand end of lug Y to a considerable distance, and forms the support for one side of the lamp holder. It also forms the current carrying connection between wire X and lamp socket Z, Fig. 360.
CAUTION. — After inserting lamp holder, be sure and tighten thumbscrew G, Fig. 360, which locks parts S and stud into good electrical contact. Unless this be done there may be arcing between the two parts, which may, in time, either injure or ruin them.
THE MIRROR.— In order that the light from the back side of the filament be not wasted, and that the light source present to the lens a solid, unbroken surface, a spherical mirror is employed, placed as per Figs. 360 and 362. The reasons for this mirror, and an explanation of its action will be found in the text matter, page 819.
It is of course vitally important that the mirror be so placed that the image it reflects, or projects, will fall exactly in its appointed place, and the Simplex equipment provides ample adjustments, in convenient form, to enable the projectionist to place the image exactly where he wants it.
CLEANLINESS.— It is essential to efficient results that the mirror be kept perfectly clean. You must polish its surface daily. This may be done by washing it with a solution of half wood alcohol and half water, or with gasoline, polishing the surface while still wet. It may also be done by breathing on surface while mirror is still cold, and polishing with a perfectly clean, soft cloth, or with tissue paper.
We would recommend to theatre managers that they proTide, for the purpose of cleaning lenses, a roll of soft high grade toilet paper. Such paper is most excellent for the purpose, and clean lenses mean much in excellence of screen results.
To remove or insert a mirror it is only necessary to loosen thumb screws X-X-X (three of them), and insert or take out the mirror, as the case may be.
CAUTION. — After inserting a mirror, be sure to tighten thumb screws X-X-X, but only sufficiently to hold the mirror in position, without exerting undue pressure. DON'T jam the