STEREOSCOPIC POINT TRANSFER DEVICE MODIFIED FOR DIGITIZED READOUT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003000020023-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: April 15, 2002
• Sequence Number: 23
• Publication Date: April 1, 1964
• Content Type: MFR

Approved For ReleasJD~)06117 NIA-RDP78B04747A003020023-2
CONFIDENT iiiL
TID/TAB - 64/6.
1 April 196+
MEMORAJNDUM FOR THE RECORD
SUBJECT: Stereoscopic Point Transfer Device Modified for Digitized Readout
25X1
Stereoscopic Point Transfer Device. This concern-stems from TAB's desperate
need for a flexible and accurate digitized stereo comparator that will
adequately meet current requirements for stereoscopic measurement.
2. Below are listed the design features that are considered controversial
and therefore debatable:
a. The present proposal calls for precision ground, ball, lead
screws with a 2 1/2 mm pitch and a system accuracy of 2 1/2 microns plus
0.005% of the distance traveled. It is believed that this degree of
system accuracy will be hard to meet with the proposed screws. This
belief is supported by discussions with several authorities on comparator
accuracy, i.e., the accuracy claims by the. manufacturer for a ground, ball,
lead screw cannot be met. TAB, therefore, is requesting a more detailed
study, analysis and documentation in order to guarantee a system as
accurate as claimed.
b. The present proposal calls for complete control of the measuring
mark of the stereo comparator by a multicontrol joystick. It is believed.
that this proposed feature would greatly decrease the versatility and
flexibility of the instrument. The amount of time consumed and the
degree of difficulty needed in the final positioning of the reticle
over a point is much greater than that required with handwheels. The
stereo comparator should be equipped with handwheels for rapid final
pointing as well as a joystick for rapid film traversing.
c. The many functions that are to be activated from the joystick
are also subject to debate. Much of the concern stems from lack of 25X1
multicontrol joystick experience. For example, will activating a
function cause changes in pointing? What happens when you accidentally
activate the laser instead of the readout function, etc.? It is suggested
Jan devote a proper amount of time to their study for concurrence
rorr-concurrence.
Declass Review by NIMA / DoD
25X1
d. 'There are, of course, other features that are of interest and
that should be analyzed more closely, for example; the type and size
of reticle, work space, adjustment of vacuum system, drift-free zoom
control, trouble-free loading, etc. It is appreciated that these features
are being adequately dealt with owever, designated 25X1
r Glad; 1
Approved For Release 200 I 4747A003000020023- Bcmced frcq automatic
dae~ngraCia; and
deaassificatlon
 CIA INTERNAL USE ONLY
Approved For ReleUs 2002/06/17 : CIA-RDP78B04747A00&p0020023-2
CONFIDENTIAL TID/TAB - 61+/6+
Page 2
TAB personnel would like to be able to inspect the development of the
product under a more accelerated schedule in order to surface any
controversy in a more timely schedule. 25X1
Orig - Chief/TID
1 - Asst/Plans and Development/Attention
25X1 .
1 - TIP/TAB
25X1
NP:IC/TID/TAB
Approved For Release 2(@0qj1i$04747A003000020023-2