Home Movies (1943)

HOME MOVIES FOR OCTOBER PAGE 331 ground noise that is heard in the pianissimo. The smaller the medium used the smaller the range, because less energy can be stored for the loud passages while the background noise remains nearly constant. This characteristic, however, is of little importance in movie sound, because large variations in sound volume are neither necessary nor desirable. Extraneous Noise: Given a humfree audio amplifier, the extraneous noises present in magnetic recording are generally caused by ( i ) mechanical vibrations in the recorder, (2) transverse and longitudinal vibrations in the wire while under the influence of the recording coil, or (3) the influence of foreign magnetic fields. Vibrations in the driving mechanism must therefore be held to an absolute minimum, because they are not only directly audible but also amplified through the sound equipment. The wire must be well guided while within the field of the recording unit, both in the recording and the playback operation. It must also be free from tension that might cause both transverse and longitudinal vibrations. The recording unit and its components must be thoroughly shielded, both magnetically and statically, from fields of the driving motor and other electrical devices. Available Data: These, then, are the major problems. How to solve them? Little authentic data are available on this subject. Aside from chance accounts encountered in technical and semi-technical periodicals, there is little information to be found beyond matter of fact statements of the principle of magnetic recording in handbooks on electrical and radio engineering. While engaged in preliminary study of sound recording techniques in 1938 and 1939, I found two or three short ai tides on various aspects of magnetic recording in the technical publications of The Bell Laboratories. Brief accounts oi experiments with this problem have likewise appeared in Electronics, a monthly McGraw-Hill publication. With the information gained from these sources, I set out on my own to learn at first hand. From here on you also are on your own. As stated at the outset, the furnishing of detail construction data is not the object of this article. Its purpose is not to tell how to do it, but what to do. If you have followed me this far, you probably still hanker to make your own. Go to it! Club Program 3dea£ . • Continued from Page }2i short episode which can be filmed with two or three persons indoors and filmed at this meeting. Select the best cameraman to handle the camera, the most apt to direct the action, etc. Explain each detail as the session proceeds. Let the members look through the view finder when camera is set up for angle shots. Let them gather around when meter readings are taken. This is the best means of conveying instruction. Incidentally, it is again time to add to the treasury. Try the "Gold Fish Bowl," idea at this meeting. It can be in progress all evening without interrupting the program. Obtain a fairly large spherical gold-fish bowl and fill it to the very brim with water. Place an ordinary whiskey glass right side up in the center of the bottom of the bowl. Have on hand for prizes, a variety of such things as reels, containers, film cement, etc., each worth about fifty cents. Members may then drop dimes into the bowl and any who succeed in dropping a dime directly into the whiskey glass are permitted to select anything they desire from among the prizes. Sounds simple, doesn't it? But an average of about one person in ten succeeds in dropping the coins so they will land in the whiskey glass. Don't empty the bowl or glass during the evening. Let the dimes pile up; it adds to the fun and the more dimes that accumulate the more new dimes they attract. October — Contest and Election. No program would be complete without a contest, but one a year is enough. Our club program has been logically arranged to make this October meeting the night for the annual contest. So many articles have been written on how to conduct this evening that a repetition would be wasting space. Before the contest, however, hold the annual election of officers. The ballots can then be counted while the pictures are being shown and the results announced at the end of the program. November — Amateur Movie Exposition. This is the "Big Night." The year's entire program has been aimed at this event. Hire a hall, a large one. Get plenty of publicity in the papers. Place announcements in the stores. Don't be bashful, tell the world about it in advance and get the biggest crowd possible. The Cine Exposition should feature booths. Have the members bring the best of all their available gadgets. Give each one a spot in which to display and demonstrate his favorite. Carefully select those which are to be displayed so there will be no repetition. Get the very best of every type of gadget. Scattered among the exhibits should be booths or r ; Get Unique Movie Shots With LOW COST LENSES THEY'RE STILL AVAILABLE . . NEW . . But Edges Very, Very Slightly Chipped FREE Big 10-Page Idea Booklet With Every Set! For ultra close-up shots, copying, movie titler, magnifying, for making experimental telephoto lens, dummy focusing camera, Kodachrome viewer, telescopes and for gadgets of your own design. The lenses in these sets will enable you to conduct countless experiments and build a wide variety of equipment. Every movie maker should have, one for present and future use. SET l-H — "Our Advertising Special" 15 Lenses for $1.40 Postpaid. SET 5-H— "The Gadgeteers Delight" 35 Lenses for $5.00 Postpaid. Set 10-H — "The Experimenter's Dream" 70 Lenses for $10.00 Postpaid. Get In on this Salvage Bargain — Order Today! Very Popular With Servicemen Dept. 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