Title: The description of a sector, for giving the proportionable sizes of wheels and pinions : and for determining the proper distance of their centers from each other : of great use to all clock and watch makers /
Authors: Pennington, R. active 1780-1823.
Publisher: Printed for Mess. Richardson and Urquhart ... ,
Year: 1780
Subjects: Gearing Design and construction Early works to 1800.; Clock and watch making Equipment and supplies Early works to 1800.