Illustrated and described in Scientific Instruments by Anthony Turner and Harriet Wynter, page 46 Fig. 47.
For further details see Benjamin Martin and the development of the Orrery by John R Millburn in The British Journal for the History of Science, Vol.6, No.24,1973.
Benjamin Martin (1704-1782) was born at Worplesdon, Surrey, the son of a farmer. He moved to London and by 1756 was Free of the Goldsmiths' Company and established in Fleet Street as an instrument maker. In 1757 he purchased the globe making interests of James Ferguson. In partnership with his son, Joshua Lover Martin, from 1777, he retired in 1780 but within two years he died and the business was made bankrupt.
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