Longitude to be found out with a new invented instrument, [electronic resource] : both by sea and land. Also, Some Reasons for finding it thereby, extracted from the Three Years Observations made at Islington by Dr. Edmund Halley, Savilian Professor of Geometry in Oxford, for knowing the true Place of the Moon, and which now are inserted in Mr. Street's Caroline Tables. With A better Method for discovering Longitude, than that lately propos'd by Mr. Whiston and Mr. Ditton. Written by R. B. secretary to the Honourable Sir Francis Wheeler, when Admiral and General in an Expedition to Martineco.