CONTRACT 705 - TASK ORDER 3

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000100150008-7
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: March 1, 2000
• Sequence Number: 8
• Publication Date: August 16, 1963
• Content Type: LETTER

Approved ForRelease2000/05/10 : CIA-RDP781304747A000100150008-7
BAUSCH & L 0 DI B INCORPORATED
R 0 C H E5 T ER 2 N E W YO R K
SubIects
Reference
Gentlemen:
Ctract 705 - Task irder 3
Lttr Mai 14) 1963
16) 196
Since my letter) & ae.ting has been held with you technical repre-
sentative* to r'eytew this projeet to determine the work yet to be
done. The following deficiencies) as previously reported) remain
to be corrected:
1) Irk urtietent illumination
2) Instabill of enlarger 'Ruppert
3) Znutficien,t film protection at the film t
(4) Lack of msgnification setting indioators
The modittcatione recommended to provide you with an instrument
which will onp1tm.nt ur photogr*ph.c laboratory are as follows:
(1) i ent 1 tn will be corrected by providing a
neer system designed for highest efficiency
dad purpoee. A 500 watt horizontal burning pro-
p will be used. It has a 12 x 114mm filament size
diameter for calculation purooses it ,,rovides
6 a The calculated brightness is 17 feet
msbert t 16X (the most severe condition) which la
a signif vement OYOV the 2i.1J2 foot candles in the
resent system, The brightnees was ealculeted assuming that
standard tracing vellum is tho diffusing medium to be used
on the clear glass screen; therefore) ell calculations assume
50% loss at this point. Additionally) a general 50% loss
in transmission is assumed for the optic's. These total
sumed transmission losses have proved to be somewhat
servative as evidenced by tests performed on a *Inns
instrument (see enclosure "A"). A preliminary assign of the
required condenser system indicatee it will consist of three
fixed-position lenses; two are planoconvex and the third a
parabolic condenser lens. The lamp may be repositioned for
optimum efficiency of the aperture. A forced air cooling
system will prevent overheating of the film.
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Approved For Re!eau 2000/05/10 : CIA-RDP78B04747A000100150008-7
2
b ity of the bas enlarger portion of the instrument
?mimes the imagery to move about om the traein5 surface as
various motions aad vibrations are transmitted throngh the
instrument* This will be corrected by the oombination of
two actions* 3peoial castors that look in rotation ttit well
as transverse movement (e?g. jarvis Jarvis) will replace
those presently used. A new enlarger framework specifically
designed for the app1icl4tion will be used. It will -)rovide
the required stability plus a means of holding the film flat
while affording adequate protection to the film.
Nylon rollers will be provided for protection of the
fthi
at the film gate, If necessary, a nylon or teflon material
will cover the film ethos for additional protection*
Nagnitication set.ting indicator* will be added when calibration
and alignment have been completed,
fle resultant instrumen will correot the d ficiencies 1itted
be representative of a production unit* ther approach is to
gidise the existing enlarger support. This is only an interim
solution,
e attach d cost ummary ref' to the cost to e lett, the
s torment as described and reaammended above. Also included
comparison purposes is the cost to complete the Instrument
as above with the exception that we would only rigidize the
present enlarger support* If this approach is taken, redesign
or the enlarger support would still be required prior to
additional production.
The instrument can be delivered 14 weeks after receipt ot your verbal
notifioation thathe additional funds have been sfloctd to this
Program. The reaidual inventory list and final report will be
submitted 30 days thereafter*
At your request. Bausch & Lomb personnel are available to ce to
4ashington to die uss in Masai the technical or cost ort am of
this letter*
25X1A
Ttbp
0.
tical &stria
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Approved For Release 28500/1164. 61A-RDP78B04,747A000100150008-7
VARIABLE MtGNIFICATIOb TRACING PROJECTOR
Illumina on. The instrument in its present form has an il
system composed of the original D-2 Enlarger condenser as
t on
and a
150 watt PAR.38 Spot Lamp. Test readings were made using this system
?operating at 120 Volts, open gate, without diffusing filters sad
with the movable mirrors set at their longest oonjugate (70 inches)
position (fully down).
Following are the readings in ft. Candles at the clear glass surface:
Lens
F.L.
4 f/5.6
7" 05.6
12" f/16
Magnification On Axis
16X 2.1/2
9X
5X 3
orners
4-1/2, 2 2, 4.?1/2
4, 8, 9, 5
2 21 2, 2
In order to evaluate the antioipated illumination level of,kredesigned
system, a comparison was made with values, both calculated and
realistic of a similar rear projection instrument.
This instrument has four fixed magnifications of 5X, 10X, 15X and
25X, a total conjugate length of 54 inches, format size 4-1/2 x 4-1/2
inches and a screen size of 30 x 30 inches. Standard drafting
vellum is the diffusing medium to be used on the clear glass screen;
therefore, all calculations assume a 50% loss at this point.
Additionally, a general 50% loss in transmission is assumed for the
optics. These total aseumed transmission losses proved to be somewhat
conservative.
The lamp usod in tha system and proposed for the VMTP is a 500.
watt, horizontal burning, projection lamp. It has a 12 x 14mm
filament size; using a 13mm diameter for calculation purposes,
it provides 8.96 candles/mm
Following are the sr
$ Focal Length
top
14sjnification
Bntrance Pupil
Diameter (mm)
Magnification
Required By
Condenser System
F# at Screen (N)
Calculated Bright
in foot
1 berts*
llumin on oal
S1oin,, Scr.en Vlewer,
2"
2.0 2.8 2.8
25X '15X 10X
2?.O 27.1 140.0
1.90X 2.08X 3.08X
60 45 L31
8
45 i80 11.69 224.
Variable Magnification
Tr n Pro e
4" 7"
5.6 5.6
8-16x 4-9x
18.0 31.7
3.58X 1.Li.ic. 2.
27
50-98 28-.56
6517
206.$2
16
2.5X
25.3
1.9x
48-93
60-22
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Approved For Release 2000/0511M C4A-RDP781304247A000100150008-7
rightness
candles
t Tetal traawn
(screen at o
conversion factor
from OE handbook
* of screen
lotion of the above va1ues a breadboard was constru
the cmponnts at the SSV syst. At 25X* where the
alie was 4$ ft. Lamberts* the Spectra Brightness
5 ft. Lamberts with standard tracing vellum as
screen. it read 800 ft. Lamberts when matte acetate drafting m
the screen. Thus* the criteria of judgment of iUtaiinit
to dependent an the screen 'can'. The above figures
re be used for oomparative evaluation of anticipated
were taken open ate;
ed and evaluated for
t standpoint. A unit ox
&anion value can be
tor of ten.
A
to
condenser
or the spar
deeign
above Calcu1atios. It 00
; two are piano-convex,'
The lamp may be repolitione
been mad* of
vex aerial photographio
in ion qualities
density of 1.0*
peoted to decree**
required
lie
env
Approved For Release 2000/05/10 : CIA-RDP78604747A000100150008-7
25X1A
Approved For Release 2000/05/10 : CIA-RDP78604747A000100150008-7
Approved For Release 2000/05/10 : CIA-RDP78604747A000100150008-7