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K-13 Compensating Gunsight

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:500.00 - 700.00 USD
K-13 Compensating Gunsight

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Auction Date:2019 Dec 04 @ 18:00 (UTC-5 : EST/CDT)
Location:15th Floor WeWork, Boston, Massachusetts, 02108, 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
K-13 Compensating Gunsight made by Sperry, measuring approximately 7? x 10? x 7?, with manufacturer's plate on the side reading: "Sperry Gyroscope Co., Inc., Brooklyn, N.Y., K-13 Compensating Sight, Part 659060, Ser. 29292, Cont. AC 3571." This is a pneumatically-powered gunsight designed to compensate for altitude and airspeed. Typically mounted on the rear housing of a 50 cal machine gun from a side/waist gun position in the aircraft. Used in Boeing B-17 Flying Fortress and Consolidated B-24 Liberator bombers during WW2. It was a late war innovation that used the aircraft altitude and speed with the direct correlation of where the weapon was pointed to calculate the reticle. The aircraft altitude and speed were programmed on the rear of the sight. The correlation was determined by drive lines that connected the K-13 Sight to the K-7 Mount. In fine condition.