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John Bird and the origin of the sextant. Rittenhouse: Journal of the American Scientific Instrument Enterprise (pp. 1-11). (/isis/citation/CBB000076518/) unapi

Article Chapman, Allan (1995)
Out of the meridian: John Bird's equatorial sector and the new technology of astronomical measurement. Annals of Science: The History of Science and Technology (pp. 431-463). (/isis/citation/CBB000070857/) unapi

Article Moskowitz, Saul (1986)
The ghost scales of John Bird. Bulletin of the Scientific Instrument Society (pp. 8-11). (/isis/citation/CBB000044631/) unapi

Article Stimson, Alan (1986)
The first marine sextant?. Bulletin of the Scientific Instrument Society (pp. 12-13). (/isis/citation/CBB000044733/) unapi

Article Gould, J. A. (1976)
John Bird: The astronomer's instrument maker (1709-1776). Journal of the British Astronomical Association (pp. 485-486). (/isis/citation/CBB000011050/) unapi