Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude

The author replies to a published pamphlet by the Astronomer Royal, arguing that the pamphlet suppressed facts and misrepresented the accuracy of his marine timekeeper. He begins with a plain explanation of how longitude is determined by comparing local solar time with a fixed reference clock, then examines the testing at the Royal Observatory, questioning who controlled the observatory clock, how comparisons and attestations were conducted, and whether locking procedures provided an effective check. He explains adjustments he made to the watch's rate while it remained in his custody and challenges conclusions drawn from the published daily rates. He cites witness statements and recalculations to rebut the official account and restore what he presents as the true record.