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, London, by W. Richardson and S. Clark and sold by John Nourse, 1768, 4to, 26pp. (of 28), 3 folding engraved plates (lacking [?] half title), disbound -- LUDLAM (WILLIAM): An Introduction and Notes on Mr. Bird's Method of dividing Astronomical Instruments, London, by John Sewell, 1786, 4to, 40pp., disbound; and 2 other pamphlets (which lack plates). (4)