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38
Motion Picture Projectionist
December, 1930
SOUND IS NO LONGER A NOVELTY
Remember — the Public still uses its Eyes at a Picture Show.
Screen flicker . . . light variation, needlessly as
well as silently, drive Patrons to other types
of amusement.
Why not look into the TRANSVERTER and its kindred equipment?
Thousands of theatres know how well it has improved their projection.
Smooth — Constant — Economical — quiet in operation— its presence in your projection room is instantly recognized — wherever installed.
// you show pictures, you need the TRANSVERTER. Ask your Supply Dealer or us for further details WHY.
Canadian
Distributors
Perkins
Electric
Ltd.
THE HERTNER ELECTRIC COMPANY
Exclusive Manufacturers of the Transverter
12688 Elm wood Avenue Cleveland, Ohio, U. S. A.
"BEST"
Magazine Light
Price $3. 60 at your dealers
attaches to side of magazine illuminating the inside showing the exact amount of film on reel from either side without opening door.
BEST DEVICES CO.
200 FILM BLDG., CLEVELAND, O.
reverse position as in Figure 11 the pointed end will present a shoulder to the film against which all splices must strike. This strain is so great as to cause torn perforations or even a break in the film especially if the splices are stiff, thick or buckled.
Many projectionists have found it advisable to substitute a slightly lighter film guide holder spring for the stiff one now furnished by the manufacturers. By this small change, less strain is put on the film at this point, with absolutely no change in screen results, wide and stiff splices, especially, going through with greatly decreased resistance thereby lessening the chance of film breakage due to the yielding of the film guide.
One of the main reasons for picture unsteadiness is an excessive amount of play between the moving parts of the intermittent movement,
FIG. 10. This is the correct position for the film guide. Arrow 1 shows the guide holder and 2 is the film guide.
FIG. 11. Here the film guide is upside down allowing the film to strike the sharp end of the guide. Stiff splices won't last under these conditions.
due to wear. Readjustment is made by means of an eccentric bearing but care must be taken to see that it is not set too tightly, otherwise the parts will bind. Projector models using an eccentric bearing at each end of the intermittent shaft should be checked carefully after an adjustment has been made, to see that both bearings are lined up correctly, otherwise the intermittent sprocket will run out of true, resulting in the breaking out of the perforation on one side of the film.
Some projectors provide for a side adjustment of the intermittent shaft by means of a collar and set-screw. Proper alignment is necessary to insure against the intermittent sprocket striking the film perforation offcenter.
Excessive wear of the pin-cross type of intermittent movement results in flat sides on the pines, thereby causing a slightly quickened pulldown which gives an added strain on the film perforation. On newer models these pins are equipped with rollers insuring smoother operation.
Proper Alignment of Upper Magazine
One widely used projection machine has an adjustment on the top maga