Theory of terminal curves for the hairspring / F. Keelhoff ; translated by G. Droz and William O. Bennett.
Keelhoff, F.
Theory of terminal curves for the hairspring / F. Keelhoff ; translated by G. Droz and William O. Bennett. - 20, 5 pages ; 27 cm
English translation of a portion of the original French work: Théorie des courbes terminales du spiral. Brussels : Académie Royal de Belgique, 1921.
Balance springs.
Spirals.
Clocks and watches--Design and construction.
Watch (general) Not Geographic hairspring termina curve unpublished manuscript watch balancewheel advanced theory TheoryGeneral Keelhoff, Fr.
Theory of terminal curves for the hairspring / F. Keelhoff ; translated by G. Droz and William O. Bennett. - 20, 5 pages ; 27 cm
English translation of a portion of the original French work: Théorie des courbes terminales du spiral. Brussels : Académie Royal de Belgique, 1921.
Balance springs.
Spirals.
Clocks and watches--Design and construction.
Watch (general) Not Geographic hairspring termina curve unpublished manuscript watch balancewheel advanced theory TheoryGeneral Keelhoff, Fr.