International projectionist (Jan 1941-Dec 1942)

Exhibit Teaches Science of Sound ATTRACTING projectionists among thousands of other visitors, a free scientific exhibit put on by Sonotone Corporation at 570 Fifth Ave., New York City, provides a world of information about sound, and presents it so picturesquely it is not easily forgotten. Of outstanding interest to projectionists is the chart, here reproduced, showing the actual frequencies of speech sounds. The position of -'s", above 6,000 cycles, and of "f", above 4,000, indicate clearly why reproduction of these sounds provide an important clue to the highfrequency response of a sound system. The effect of loss of high frequency response is graphically illustrated when the visitor presses a button; the sentence at the top of the chart is distorted to read only: "-OF -EA-NE— -I—OR— -EECH" ; while the letters h, p, d, t, /, s, disappear from the body of the chart. Also of particular interest to projectionists is the little ear trumpet here shown, which represents a kind of radioless radio; for it picks up sounds without wire connection, but it does not use radio principles or radio-frequency currents. It is simply the secondary coil of Induction trumpet — a "radioless radio". an audio-frequency sound transformer, connected to a small earphone; the primary coils are hidden in the walls. As the visitor progresses through the exhibit, he puts the trumpet to his ear wherever he sees an orange light, and a little lecture comes to him from the primary The letters h and p and all letters to the right of them disappear from this chart when a button is pressed. The sound frequency corresponding to each of these letters can be found byreferring to the row of figures along the bottom of the chart. • oil hidden behind the wall .it that point. I hi also i how he bears th< sound "( a small-screen sound motion picture. Imong othei exhibits "I interest there i u highly decorated panel with gome vertical lines running through it, and a flashlight "pistol." \ loudspeakei delivers pure tones of from 60 i" 15,000 cycles, according to which vertical line the visitor chooses i<> illuminate, lb can, dentally, test whether hi awn hearing goes lip io 15,000 cycles, "i stops at 10.000 or less. At other portions ol the exhibit the visitor can make a recording "i hi own voice mi a steel tape and listen back in ii immediately, lb sees dissected portions of the human i-ar. while signs and his little induction-trumpet explain the mechanism of hearing. There i also a movie short of the mechanisms 'it hearing, and another of the progress oi eai disease. Bone conduction hearing units demonstrate that sound vibrations ran easily In fell by tin fingers, ami can Inheard, with complete intelligibility, through the nose-bone or cheek-bone or temple. BELL LABS WINS AK Ml NAVY "E" AND EMBLEMS FOR EMPLOYES The Army-Navy "E" was awarded to tinBell Telephone Laboratories in a ceremony which marked, as one of the speakers ~aid: "the first occasion ... of an Army-Navy award to an organization which produces ideas in contra-distinction to equipmeni ... in quantity manufacture." Representing Bell Laboratories at the ceremony were Dr. F. B. Jewett, chairman of the Laboratories Board: Dr. 0. K. Buckley, President; Eric Weil, Miss Eleanor I.. Freeman and Franklin A. Korn. representing employes. Colonel Hex Corpul of the Signal Corps spoke for the \rmy. Lieut. John D. Lodge for the Navy. Because Laboratories' workers are now scattered through many location in the Slate of New Jersey, as well as New York City, it was not thought patriotic to consume travel facilities and time to bring them all together for the ceremony of acceptance; but 400 employes, .elected |,\ lottery, were present. Lapel emblem-, inscribed "a symbol of high service to America." were mail d to more than 5.000 others. WPB CUTS DOWN USE OF FILM Allotment of film to motion picture producers will be cut by as much as 24 percent of their 1941 consumption, the War Production Board has announced. The largest users will ha\e to take the heaviest cuts. Smaller users will get up to 90 percent of the 1941 consumption. There will be no cut in the film allotted for newsreels: for pictures for the armed services; pictures approved by the Bureau of Motion Pictures, as having morale or propaganda value, or for e-sential scientific purposes or research. Cases of special hardship will be subject to review and reconsideration. DECEMBER 1942 11