ntage that it is suitable for large dials, asthe screw may be run in a box of oil for dials above fourfeet and for tower clocks and outside work. This will read-ily be seen to be an important advantage in the case of large THE MODERN CLOCK. 419 hands when they arc loaded with snow and ice,… … Fig.143. Minute jumper. A, armature; M, magnets; W, worm gear oncenter arbor; B, oil box for worm; R, four toothed ratchet. Direct action of the current in such cases is impracticable,as the speed of starting with an electric current wouldcause the machine to tear itself to pieces. This screw gear…
Clocks and watches
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