DescriptionGemini 12 Training-Used Gemini Tethered Vehicles NASA Book Directly from the Personal Collection of Commander James Lovell, Signed and Certified, with Signed LOA. A staple-bound publication, #S-66-4175 APR 21, 10.5" x 8", consisting of approximately forty printed pages most of which are charts and tables. The objectives as stated are to evaluate the feasibility of: (1) Station keeping by gravity gradient stabilization of the tethered system; (2) Station keeping by slow rotation of the tethered system; (3) Maintaining vehicle attitude by the gravity gradient effect on the vehicles; and (4) Setting up an artificial gravity field by rotation of the tethered system. Tethering was an important part of the Gemini 12 mission. On one page, Lovell has crossed out a printed graphic and hand-drawn another one on the adjacent blank page. He has signed on the front cover: "James Lovell/ Gemini 12 Commander/ Used in training". Fine condition with light wear and soiling from use.
Included with this lot is a signed letter of authenticity from Lovell on his company letterhead stating: "The publication 'Gemini Tethered Vehicles' was developed for the Gemini XII flight to evaluate the feasibility of station keeping by gravity gradient stabilization of a tethered system. This publication was used by the Gemini XII crew to prepare for the gravity gradient experiment. The resultant flight proved the gravity gradient concept."
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