Waltham Watch papers. volumes 1 & 2 / Waltham Watch Company.

v. 1. Isochronism of balance-springs -- volume 2. Compensation by the balance, with observations upon isochronism (Extracts translated from Jürgensen's Principes de l'exacte mesure du Temps" -- The chronometer and its adjustment (from the Horological Journal) -- "Is it advantageous to jewel a watch throughout" (from the Horological Journal).

31560000082160 18179

Both Volumes in one Book: horological science papers published 1862 on watch theory: Vol I: Isochronism of Balance Springs,{Annonymous}, Vol. 2 Compensation by the Balence with observations upon isochronism. {extracts translated from Juergensen's Principles de l'exacte mesure du temps}; The Chronometer and it's adjudtment [Samuel May in Horological Journal}; Is it advabtageous to jewel a watch throughout [By Mr. Jackson, in Horological Journal};