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FOR MANAGERS AND OPERATORS 173 whether paint or paper is used, block out both ceiling and walls in panels. If paint is used you may secure, from any decorator, stencils suitable to properly decorate the bor- ders of the panels. If paper is used there are many panel decorations possible. As to the color scheme, there are many, but a combination of dark red dado, russet or dove colored walls, with panels of a lighter shade and ceilin"' some light, complimentary color will look well as also will dark green dado, lighter green walls with very light yellow panels (greenish yellow) and ceiling same as panels will look well. The stucco moulding may be the same as the walls or panels and picked out in bronze paint. Measuring Lenses. —Franklin, La., asks which end of a projection lens should be next the light and which next the wall when measuring focal length? Also asks if measurement should be from point midway of the lens to the wall. In measuring projection lenses, stereo or moving picture, I usually hold the lens as it would be in the machine, were the wall the lamphouse and the window the curtain. In other words, with the front end of lens next the window or source of light, and with back end towards the wall. Projection lenses are made up of two sets of lenses mounted in a tube at a distance from each other varying with the focal length of the lens. The longer the focal length the greater will be the distance between the two lenses. The first thing I do when I measure a lens for equivalent focus is to mark on the outer surface of the lens tube, or jacket, the point ex- actly half way between the two lenses. When I have focused the image of the window, or lamp filament (if I use a lamp as source of light), I measure from this mark for "equivalent focus" or from the back side of lens nearest wall to the wall for "back" focus. Dealers and exchanges usually use the "back" focus, while lens manufacturers generally use the "equivalent" focus. In ordering lenses of a given focal length always state whether you refer to "back" or "equiva- lent" focus. The diiiference between the back and equivalent focus of any lens will be the back focus plus half the dis- tance between the front and back lenses. Current Strength. —Nashville, Tenn, asks: "(i) What is best capacity for arc on direct current for long throw on moving picture work? (2) Assuming that from a light stand- point 60 amperes at 50 volts is satisfactory, would there be danger of the film catching fire due to the intense heat of such an arc, remembering that D. C. would develop greater heat than A. C? (3) Is it possible to say how many seconds it would require to set film on fire from heat of a 60-ampere, 50-volt arc?" (i) It takes no jnore current to project a given size picture