CONTROL #02228

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A001200010111-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: April 17, 2012
• Sequence Number: 111
• Publication Date: August 9, 1968
• Content Type: LETTER

Declassified in Part - Sanitized Copy Approved for Release 2012/04/17: CIA-RDP78B04770A001200010111-6
Augst 9 6
";UG ij 3'f~1
Attention: Mr. Ed D.
Subject: Control #02228
In response to your request in a meeting at the
we presently expect to employ on the console for the twin stage comparator
furnished under control number 02228.
on 1 August we are submitting a list of the instrument controls
1. One joystick to control direction of stage motions
2. One knob for selecting ratio of motor speeds between the two stage
motions
3. Three push switches for selecting left, right, or simultaneous
stage motion in response to actuation of the joystick control. A
three position rocker switch may finally be substituted to replace
these three push switches, as suggested at the meeting of
1 August 1968.
4. Eight indicator lamps to provide visual indication that a stage'
motion has reached its safe limit of travel and stopped. It is
intended that the eight indicator lamps be arranged on the console
to form two crosses, located side by side. The cross to the left
will be associated with the left hand stage motions. The vertical
leg of each cross will represent extreme Y axis stage motions.
That for the X axis will be represented by the horizontal leg of
each cross.
Whenever a stage motion reaches its safe limit of travel
an electric limit switch is activated. This action simultaneously
de-energizes the motor circuit to prevent damage to the compa-
rator, and illuminates the indicator lamp associated with the
extreme end of travel for this stage motion.
5. Two knobs to position the rheostats employed to set the level of
illumination for each leg of the viewing system.
6. One toggle switch to control the substage illumination lamps
located beneath the X and Y axis stages.
Declassified in Part - Sanitized Copy Approved for Release 2012/04/17: CIA-RDP78B04770A001200010111-6
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/17: CIA-RDP78BO477OA001200010111-6
'Wow *WW
Mr. E. D. August 9. 1968
Information pertaining to the physical size and weight of the joystick
control assembly has not been included in this letter because our present
model may not be suitable for use with the motor drive units which will be
designed for use on the twin stage comparator. This information can,
however, be submitted when the final joystick design is completed.
A scale drawing of the twin stage comparator and instrument console
will be started the week of 11 August 1968. A print of this drawing will be
forwarded as soon as it is completed.
Assistant Manager
HBB/ed Engineering
Declassified in Part - Sanitized Copy Approved for Release 2012/04/17: CIA-RDP78BO477OA001200010111-6