(Sanitized) MODEL 1540-4 LIGHT TABLE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000400030012-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 1
• Document Creation Date: December 28, 2016
• Document Release Date: June 6, 2005
• Sequence Number: 12
• Publication Date: March 1, 1972
• Content Type: MEMO

OPTIONAL FORM Approved For Release,o20
UNITED STATES GOVERNMENT
emorandum
TSG/RED (ATTN:
E8B051 71 A000400030012-7
C-0111/DI-8E
DATE: 1 March 1972
5XsFBJECT: I Nodel 1540-4 Light Table
1. The results of the subjective DI-8 imagery
of the "prototype" model 1540-4 light table
follows:
25X1
interpreter evaluation
are as
a. Occasional "rough" travel evidenced in "X" direction at slowest
speeds.
b. Time from initialization of carriage drive to attaining set
speed in "Y" direction exceeds specified limits at several carriage
positions.
c. "X" carriage lock malfunction: optics mount moves approximately
.055 inch with less than three pounds pressure applied.
d. Optics carriage evidences a tendency to stop moving during'X-Y "
scanning operations.
e. Experienced difficulity focusing Zoom 240 in stereo at high
magnification. Optics mount drifted downward necessitating constant
refocus. Some evidence of side-to-side focus mount movement noted.
f. Experienced temporary failure of right side light source. (Only
one rear tube would light).
g. Zoom 240 loose within optics mount.
h. Maximum operating speed of carriage drive less than required.
2. This Office also understands the table failed to meet some of the
written specifications during the TEB phase of evaluation.
3. Request "be officially notified the table does not meet operational/
written requirements and that corrective action be initiated.
4. DI-8 believes the aforementioned deficiencies to be correctable as
the light table has operated more favorably in the past. However, there
is real concern that the apparently deteriorating operating condition of
the table evidences a potential intolerable maintenance situation.
Declass review by NGA/DoD
This document indicates a Yelati6nahi~
between N.P.I.C. and the origitatat
therefore, a CONFIDENTIAL claca proved For Relea
U- ~
b assigned)
e a ion
.Llaugtry Equipment Officer
jDP78BO51 71A00040003001 2-7