John Harrison and his timekeepers /
Gould, R. T.(Rupert Thomas),1890-1948.
National Maritime Museum (Great Britain)
London : National Maritime Museum,
1987.
Reprinted from the Mariner's Mirror, the quarterly Journal of the Society for Nautical Research, Vol. XXI, no. 2 April 1935
Harrison, John, 1693-1776.
Clocks and watches.