dby resting against the foot of the shoulder to which the balance issecured. This will be understood by inspecting Fig. 137, which isa vertical longitudinal section of a chronometer balance staff, thelower side of the impulse roller being cupped out at c with a ballgrinder and finished a ball… … Fig. 137 roller and has a jewel similar to the impulse jewel a shown at f.This roller is fitted by friction to the lower part of the balance staffand for additional security has a pipe or short socket e whichembraces the balance staff at g, The pipe e is usually flattenedon opposite sides to admit…
Clocks and watches
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