Pivots and Caps in Compasses

78 pages, with 88 illustrations. Original cloth binding with gilt lettering. Top of spine worn, couple of marks on covers, library number 681.2 stamped on spine else in very good condition. Very Rare ! A report prepared for the British Admiralty and published in 1917 by the Government Stationery Office. Contents include: Chapter One - The elementary theory of the inter-action of two highly polished surfaces in contact under pressure. Chapter Two - Materials: The chemical composition, physical properties, and occurrence of the principal substances examined to determine the degree of suitability for pivots and caps. Chapter Three - Typical examples of compass pivots and caps under various conditions of service and tests. Chapter Four - The correct shape of pivots and caps. Chapter Five - The selection of tests and materials. Chapter Six - The manufacture of pivots and caps. Chapter Seven - System of examination of finished product.