Projection engineering (Jan 1932-Mar 1933)
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FEBRUARY, 1932
Page 21
P-A.. SPECIFICATIONS
HEREWITH is a form of questionnaire suitable to forward to persons desirous of procuring equipment or an installation for public-address uses. With the answers1 to these questions in hand the manufacturer is in position to advise and to quote.
1. Is the installation for the purpose of reaching :
a. Indoor audiences?
b. Outdoor audiences ?
c. Both indoor and outdoor audiences ?
2. If an indoor installation, what are the dimensions and what is the cubical content (width x length x height) of the, room or space to be covered?
3. What are the acoustic properties of the room or space to be covered? Answer the following questions :
a. Are the walls bare ? State whether wood, plaster, stone, brick or beaver-board.
b. Are there many draperies in the room?
c. Has the room been treated for acoustical defect?
d. When the room is filled, normally, is there apt to be a good deal of space around the audience? In other words, does the seating capacity take up all the available space outside of the aisles ?
e. Is the height of the room greater than its length or breadth ? Give dimensions.
f. Is there a balcony seating an audience ?
4. Are the loudspeakers desired at one end of the hall or are they to be located in the center of the room, or suspended from the ceiling? If any special speaker placement is particularly desired, so state.
5. Are additional speakers required to serve sound to other rooms or out of doors? If so, how many, and state whether indoor or outdoor. If indoor, give same information for this room as was asked under question 3 for the main room. If outdoor, mention area to be covered and advise if there is an unusual amount of noise in the vicinity.
6. If an outdoor installation, state the exact area to be covered by. sound.
7. Is the location of the outdoor installation noisy? Are there nearby any of the following: Car lines, heavy.automobile traffic, machinery in operation ? If so, describe the sound effect of this extraneous noise upon the location to be served.
8. Is the installation desired for speech only, or will it be used for the following as well :
a. Reproduction of music, played by an orchestra on premises.
b. Reproduction of music or speech from phonograph records.
c. Radio reproduction.
9. What type of electric current supply is available ? Specify :
a. Voltage.
b. Alternating or direct current.
c. Frequency, if alternating current.
10. Describe in detail, location of sound pickup with respect to loudspeakers.
a. Voice.
b. Music from orchestra.
c. Phonograph reproduction.
d. Radio reproduction, and if so give make and model number of radio set.
Send a pencil sketch of the rooms and spaces to be served with sound.
LARGE P-A. SYSTEM FOR HIGH SCHOOL IN NEW YORK
THE first step in the recently announced program to test the potentialities of the sound motion picture as an aid in teaching in the New York public schools was taken on January 15 when contracts were signed for the installation of RCA Photophone sound reproducing equipment in the new Samuel Gompers industrial high school for boys, 145th Street and Wales Avenue, Bronx, New York, which is now under construction and which will be open in September. The
equipment, one of the recently introduced all a-c. operated types, will be installed in tin assembly room which will have a seating capacity of 724 persons.
Provisions for the installation of motion picture apparatus having been made when the plans for the new building were drawn, the projection booth and necessary wiring throughout to the loudspeaker apparatus behind the screen, will be modern to the most minute detail.
Dr. Eugene A. Colligan, associate school superintendent in charge of the visual instruction activities of the New York board of education recently announced that he had suggested experimenting with sound pictures and it is said that other installations will be made in high schools within the next few months.
Dr. Charles Pickett will be principal of the new Samuel Gompers high school, which will have a pupil enrollment capacity of 1,696 boys. In addition to sound motion picture apparatus, the new school will be equipped with a complete radio communication system with outlets and speakers in all parts of the building. A radio control room will adjoin the principal's desk and through the medium of a microphone, the principal will be able to speak to one or all rooms or even to students upon the outdoor courts. Seventy-six loudspeakers will be located at various points of vantage.
AAA
Left: Front view of rack and panel equipment for public address recently installed
in St. Paul Auditorium, St. Paul. Minn.
Right: Rear view of panel installation. (Made by Samson Electric Co.. Canton. Mass.)