8121

Apollo CM Optical Unit Sextant Bellows Assembly

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:2,000.00 - 4,000.00 USD
Apollo CM Optical Unit Sextant Bellows Assembly

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Auction Date:2017 Apr 20 @ 18:00 (UTC-5 : EST/CDT)
Location:236 Commercial St., Suite 100, Boston, Massachusetts, 02109, United States
ALS - Autograph Letter Signed
ANS - Autograph Note Signed
AQS - Autograph Quotation Signed
AMQS - Autograph Musical Quotation Signed
DS - Document Signed
FDC - First Day Cover
Inscribed - “Personalized”
ISP - Inscribed Signed Photograph
LS - Letter Signed
SP - Signed Photograph
TLS - Typed Letter Signed
Apollo Optical Unit sextant bellows assembly, approximately 11? in diameter and 6.75? in height, made of stainless steel and consisting of a doubled ring wall, with part and manufacturing numbers stamped into lower base ring, "Flexonics 107921, A. C. Spark Plug 1899952, Serial No. 83B5603," and dated "8–26–63." In fine condition. This bellows was used to form a seal between the Apollo Optical Unit Assembly sextant side and the Command Module wall. Isolating the optical unit from structural stress, the bellows' flexibility slowed for slight changes in the Command Module wall as the pressure changed from earth atmospheric to space vacuum. An integral part of the Apollo Optical Unit sextant, which allowed astronauts to update the IMU's settings based on sightings of stars and planets.