Free Preview of Directions For Using The New Improved Hadley's Quadrant; With The New Method Of Adjusting The Glasses For The Back Observation. ... Made By P. And J. Dollond, ... In St. Paul's Church Yard, London.
Directions For Using The New Improved Hadley's Quadrant; With The New Method Of Adjusting The Glasses For The Back Observation. ... Made By P. And J. Dollond, ... In St. Paul's Church Yard, London.