Educational screen & audio-visual guide (c1956-1971])
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^ ihey respond...
when you teach with the
AO Spencer Opaque Projector
SO EASY Teaching and learning are much easier with this unique projector. You just flip a switch to project a big, bright picture of your teaching materials exactly the way you want to show them. ..subjects become dramatically alive... and your class responds as a unit. You teach more effectively because you show what you mean. Learning is more fun this way.
SHARPEST IMAGE Coated objective optics cut internal glare and reflection. With the exclusive all-glass reflecting system, this guarantees a sharp, crisp image on the entire screen . . . edge to edge. . corner to corner.
1,000 WATT INTENSITY High-powered illumination shows a clear, detailed picture in a semi-darkened room, or even a normally lighted room with shades up. The entire system is cooled by a quiet, motor driven fan... a constant stteam of air over projected copy keeps it safe.
STURDY, PORTABLE The projector is built of rugged, light-weight, lifetime aluminum. Carry it anywhere. Precision mechanical fitting throughout assures permanent optical alignment.
Colorful, inslruclive 8 page BROCHURE available — JusI clip end mail the coupon below for complete details and specifications.
Dept. N-241
Please send me AO Spencer Projector Brochure #SB3500.
Name
Address. City
-Zone State.
Calendar of Coming Events
Feb. 14-19— AASA national convention
Atlantic City, N. J. Feb. 26-28-Harwald Co. annual A\
Cracker Barrel, Evanston, 111. Mar. 16-18 — Third Medical Motioi
Picture Workshop, Calvin Company
Kansas City, Mo. Mar. 22-25— California Association o
Secondary School .Administrators
Sacramento, Calil. Apr. 1-4American Film Festival, Nev
York City. Apr. 2-3— Illinois Audio-Visual Assu
ciation, conference, Springfield, III Apr. 13-16— DAVI annual conventioni
Seattle, Wash. Apr. 17-18-NAVA Western Confer
ence, Olympic Hotel, Seattle, Wash Apr. 29-30— Columbus Film Festival
7th annual. Fort Hayes Hotel, Co
lumbus, Ohio. May 4-8 — SMPTE, 85th semiannua
convention, Miami, Fla. May 6-9— Institute for Education b'
Radio Television, Deshler Hiltot
Hotel, Columbus, Ohio.
Maximum Life From Your Projector Bulbs I
H. J. Hanbury, photo lamp market ing manager for Westinghouse, likes t£ sell projector lamps, but also want: each lamp to give its user full service Among his suggestions on how to gei maximum life and best results froir projection and exciter lamps are:
(1) Avoid rough handling. Lamp: filaments are complex and very closel) spaced; they are easily damaged b) abuse. Never move the projector while the lamp is lit, except for normal till adjustment, and avoid operation in abnormal position. That spare lamp in the speaker case should be well cushioned, preferably in its original, packing or equivalent.
(2) Keep the cooling system cleai of obstruction. If the projector is placed on paper or light cloth to pro^ tect furniture, make sure this is nol sucked into the air intake opening
(3) Unless the reflecting mirror behind the lamp is properly focused ii may overheat the lamp.
(4) Be sure lamp rating corre , sponds to the actual line voltage. A I 115-120 lamp used on 125 volt currentl will have a shorter life although iij burns brighter. The same lamp on 100 volt line current will give less light but will last longer. Normal lamp life averages 25 hours; the range may be anywhere from 10 to 50 hours.
(5) Replacement exciter lampi should be identical in voltage and amperage rating to the original. Deviations will certainly result in inferior sound reproduction and may cause a burnout.
66
EdScreen & AV Guide — February, 1959