Roy, Major General William :AN ACCOUNT OF THE TRIGONOMETRICAL OPERATION WHEREBY THE DISTANCE BETWEEN THE MERIDIANS OF THE OBSERVATORIES OF GREENWICH AND PARIS HAS BEEN DETERMINED 

Published in 1790, 1st Edition. Measures 10.5" x 9". Published by the Philosophical Transactions of the Royal Society of London.

Bound in full brown calf, edges rubbed, hinges repaired, marbled boards, spine replaced, bookplate of Joseph Smith, 4 folding tables, 11 folding large plates all intact and unfoxed. Text block very good, clean and tight. A scarce and important tome. Roy, who designed and built some unique equipment at the time which eventually helped to conclude the disagreement over the difference in longitude between the Paris and Greenwich observatories.