Harrison's chronometers: folder containing early 20th century working drawings of Harrison's No. 3 timekeeper; and diagrams of escape wheels of H2 and H3 by RT Gould, 1931-37.
Harrison's chronometers: folder containing early 20th century working drawings of Harrison's No. 3 timekeeper; and diagrams of escape wheels of H2 and H3 by RT Gould, 1931-37, (see GOU/, section 4).
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