XIV. A letter from Mr. Peter Dollond, to Nevil Maskelyne, F. R. S. and Astronomer Royal; describing some additions and alterations made to Hadley's quadrant to render it more serviceable at sea

Abstract

Reverend Sir, The particular attention, you have always shown to any improvement tending to the advantage of astronomy or navigation, makes me take the liberty to trouble you with an account of some additions and alterations I have lately made to the Hadley's quadrant.