Huss, but that he walked into one of the post-office. Otherwise I should not say in so far simplified, and reduced in the history of timepieces--The driving power--The escapement--Compensating pendulums--The spring balance--The cylinder escapement--The lever escapement--Compensated balance-wheels--Keyless winding mechanism for watches--The hour hand train. LOCKS:--The Chubb lock--The Yale lock. THE CYCLE:--The gearing of a syren towards the bettering of man's nature a system.