Changes in force: C 2, C 4, C 5, C 6 and C 7
TM 11-2323
C 7
PROJECTORS PH-637/PFP AND PH-637A/PFP; PROJECTORS,
STILL PICTURE PH-637B/PFP AND PH-637C/PFP; AND
SPINNER, POLARIZER BM-34(A)
HEADQUARTERS
Change
DEPARTMENT OF THE ARMY
No. 7
Washington, D.C., 4 December 1964
TM 11-2323, 7 April 1954, is changed as indicated to include Spinner,
Polarizer BM-34(A) procured on Order No. AF 33 (657) 13352.
Note. The parenthetical reference to a previous change (example: "page 1 of
C 6") indicates that pertinent material was published in that change.
Change the title as shown above.
Page 3, paragraph 2c (page 1 of C6), line 7. Delete the address
and substitute: Commanding General, U.S. ARMY Electronics Com-
mand, ATTN: AMSEL-MR-MA, Fort Monmouth, N.J. 07703.
Page 46. Delete chapter 4 and substitute:
CHAPTER
AUXILIARY EQUIPMENT, SPINNER, POLARIZER
BM-34(A)
48. Description and Data
a. Purpose. Spinner, Polarizer BM-34(A) (spinner) (fig. 23.2)
provides the projector with an animating capability.
b. Use. The spinner is used to animate transparencies on which a
special polarizing material has been preprinted or hand-set. The
spinner is specifically designed for mounting on the PH-637(*)/PFP
series projectors.
c. Technical Characteristics.
Operating power-------------------110 to 125 volts, 50 to 60 cps.
Current------------------------------0.15
ampere.
Polarizer rotation---------Continuously variable from 20 rpm to 180
rpm.
Motor speed---------------------3, 200 rpm (maximum)
Light transmission---------------38-40 percent of transmission light.
d. Description. Spinner, Polarizer BM-34(A) (fig.23.2) is a single,
self-contained, portable unit. The high-impact styrene spinner hous-
ing contains a motor, rotating polarizer, an on-off power switch, and
a variable speed control resistor to control the rotational speed of the
motor and the polarizer. A neon lamp indicates when power is applied
to the motor.
1
TAGO 763B