Canadian Jewellers Association · Toronto : Maclean-Hunter Pub. Co · leaf 534
GAS VAI.VE AND CONTROLLING MAGNET. with varying success, to adjust their chronometer so that its rateswill change but little as the temperature, rising or falling, changesfrom the temperature of compensation. The tests at theObservatory show how they have succeeded in their efforts toattain these…
Jewelry · Jewelry trade
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
