LINEAR PHASOLVER MEASURING ENGINE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020062-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 1
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 62
• Publication Date: July 21, 1964
• Content Type: LETTER

Approved For+ease 2005/11/21: CIA-RDP78BO477 02900020062-2
July 21, 1964
LINEAR PHASOLVER MEASURING ENGINE
Thank you, John, for the loan of your copy of the booklet
on the Analytical Plotter. I obtained a copy of my own
and am returning yours herewith. I will suggest to
that he get a copy. Note on pages 149 and 150
that the measuring engine structure of the AP-1 is made
of special aluminum castings, stabilized and tempered.
Also, the carriage moves on ball bearings on tubular
supports. The comment is made by that the
structure has remained unchanged through four models
and is considered to be stable and accurate. This
reinforces my opinion that the mechanical geometrical
design of the engine is of equal im rtance to the
stability of the materials used. paid particular
attention to compensating for therma expansion of
the metals used.
A significant factor to consider is that II was
aiming for + 2 micron accuracy while the phasolver
is aiming for less than 1 micron accuracy. I am sure
that to get submicron measuring accuracy, as much
attention must be paid to the structure as was paid
to the measuring device.
Enclosure
Declass Review by NGA.
STAT
STAT
STAT
STAT
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020062-2