Bird (John, mathematical instrument maker): The Method of Constructing Mural Quadrants, exemplified by a description of the brass mural quadrant in the Royal Observatory at Greenwich, published by Order of the Commissioners of Longitude, London, for W. Richardson and S. Clark and sold by John Nourse [and others], 1768, 4to, 26pp. (of 28), 3 folding engraved plates (lacking [?] half-title) -- Ludlam (W.): An Introduction and Notes on Mr. Bird's Method of Dividing Astronomical Instruments, London, for John Sewell, 1786, 4to, 40pp. -- Ramsden (J., mathematical instrument maker and optician): Description of an Engine for Dividing Mathematical Instruments, published by Order of the Commissioners of Longitude, London, by William Richardson and sold by John Nourse, 1777, 4to, 18pp; Description of an Engine for Dividing Straight Lines on Mathematical Instruments, London, by William Richardson and sold by John Nourse, 1779, 4to, 16pp., together 4 pamplets, disbound. (4)