International projectionist (Oct 1931-Sept 1933)

INTERNATIONAL PROJECTIONIST June 1932 A NEW BOOK BY CAMERON QVESTIOIVS & ANSWERS (SOUND MOTION PICTURES) THE SUBJECT OF RECORDING AND REPRODUCING OF SOUND MOTION PICTURES COVERED IN QUESTION AND ANSWER FORM Here are 35 of the 542 questions that Canadian projectionists must be able to answer correctly to obtain a "grade A" card. HOW MANY OF THESE CAN YOU ANSWER CORRECTLY? If excessive plate current develops, what would you do? How is amplijficatioii accomplished? "Would any kind of synchronized motor or constant speed' motor do for sound projection? Why are all the wires carrying sound or speech, lead covered and again enclosed in conduit? What is the "gain" control, and what are its functions? What would a low plate reading on the panel indicate? How many tubes in a D. C. and A. C. motor control cabinet? The photo-electric cell has a silvered lining, and one wire is connected to the lining. Is this wire positive or negative? Does the voltage to the photo-electric cell cause a steady current flow? What and where is the grid leak in the amplifier? What is the function of the exciting lamp? What is the action of (a) the plate (b) the grid (c) the filament in a vacuum tube? What might result from placing motor generator sets and batteries in the same room? Explain what a rectifying tube does? What is "specific gravity"? What are the causes of motor-boating? Why does the needle on the disc travel from the centre of the disc to the outside? On Vitaphone disc, is the sound recorded on the bottom of the track or groove, or is it cut into the walls of the groove? What apparatus "do the "H" batteries supply with current on W. E. and N. E. equipment? Should all motor generator sets be grounded? If so, state why. What is a prismatic condenser? When using a prismatic condenser, will the condenser be closer to the aperture than if you used a piano condenser? Can a prismatic condenser be used when showing slides? When using a Cinephor condenser system, is accuracy in the focal distance of much importance, and why? Can a cracked mirror or condenser be used with mazda projection? "What will be the result on the screen? What is the average amperage on (a) high intensity (b) reflector arc (c) fallow arc? If the voltage drops, what effect will the cutting out of resistance have? In an electric arc circuit, what various things offer resistance to the flow of current? What is the standard aperture size? Why does a cracked condenser show up when projecting slides and not when projecting film? Define the following: collector lens, piano lens, meniscus lens, converging lens, condensing lens. What is absorption of light? What is the optical axis? What causes film to buckle, and what effect has this on the screen? Which make of projector has an actual faster movement — that is, the movement of the intermittent from full rest to full rest? All of the 542 Canadian examination questions, with several hundred others, are answered for you in this new book. The subject of Sound Motion Pictures fully explained in an "easy-as-A. B. C" manner. 240 PAGES— OVER 1,000 EXAMINATION QUESTIONS WITH ANSWERS— PRICE $3.50 CAMERON PUBLISHING CO. Woodmont, Conn. Here is my Three dollars fifty cents, send me my copy of QUESTIONS AND ANSWERS ON SOUND MOTION PICTURES. Name Address I. p.