Projection engineering (Jan 1932-Mar 1933)

Page 32 PROJECTION ENGINEERING A New Book by Cameron Now on thePress EXAMINATION QUESTIONS & 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 vHOW MANY OF THESE CAN YOU ANSWER CORRECTLY"? If you develop excessive plate current what would you do? How is amplification 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; 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. or 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, hi-low 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, menicus lens, converging lens, condensing lens? What is absorption of light? What is the optical axis? What causes film to buckle; 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 hundreds of 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. THE BOOK WILL BE PUBLISHED AT 3.50, BUT YOU CAN SAVE A DOLLAR BY TAKING ADVANTAGE OF THE SPECIAL PRE-PUBLICATION OFFER FILL IN THE COUPON NOW CAMERON PUBLISHING COMPANY Woodmont, Conn., U.S.A. Here is the special pre-publication price of 2.50. Send me a copy of QUESTIONS AND ANSWERS as soon as ready to the address below. I understand that I save a dollar by ordering now. Name. Addr THIS COUPON WILL BE HONORED UNTIL DAY OF PUBLICATION ONLY, WHEN PRICE BECOMES 3.50 SAVE A DOLLAR BY MAILING THE COUPON TODAY