Details
HARRISON, John. The Principles of Mr. Harrison's Time-Keeper, with plates of the same. Published by Order of the Commissioners of Longitude, London: W. Richardson & S. Clark and sold by John Nourse and Mess. Mount & Page, 1767. 4 (256 x 195mm.), half title, 10 folding engraved plates (plate VIII torn and repaired on verso, some very light spotting at outer edge of plates), modern calf-backed boards. Baillie p.272-4; Bromley The Clockmakers' Library 205; Grolier/Horblitt 42b.
'There is a preface by Maskelyne and notes taken by him on the occasion of the 'discovery', when Harrison took his watch to pieces in the presence of several people, including Mudge and Kendal. Then follow three pages of obscure general description by Harrison, and a statement naming the parts shown in the drawings. The drawings are beautifully executed, but it would be very difficult to understand the mechanism from the book.' (Baillie)
'There is a preface by Maskelyne and notes taken by him on the occasion of the 'discovery', when Harrison took his watch to pieces in the presence of several people, including Mudge and Kendal. Then follow three pages of obscure general description by Harrison, and a statement naming the parts shown in the drawings. The drawings are beautifully executed, but it would be very difficult to understand the mechanism from the book.' (Baillie)