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).