. Hardware merchandising January-June 1898. Figure g. concentrically attached to each side of thecrank bracket, and a pair of hollow cranksresembling in shape the figure 8, one-halfof each crank encloses a sun wheel theother or outer half a *planet wheel, of thesame size as a sun wheel, and, engagingdirectly there with each pedal, is screwedinto a planet wheel at a point midway be-tween its centre and the pitch line of itsteeth. In the bicycle under trial the maincrank and the pitch diameter of the sun andplanet wheel was 6^ inches, the axes of thepedals were 1 19-32 inches from the axes ofthe
. Hardware merchandising January-June 1898. Figure g. concentrically attached to each side of thecrank bracket, and a pair of hollow cranksresembling in shape the figure 8, one-halfof each crank encloses a sun wheel theother or outer half a *planet wheel, of thesame size as a sun wheel, and, engagingdirectly there with each pedal, is screwedinto a planet wheel at a point midway be-tween its centre and the pitch line of itsteeth. In the bicycle under trial the maincrank and the pitch diameter of the sun andplanet wheel was 6^ inches, the axes of thepedals were 1 19-32 inches from the axes ofthe planet wheel. Figure 6is a diagram showing the pedalsmovement. The foot motion is but slightlydifferent from the circular motion now in. Figure 9. Figure 8. The sun and planet wheel is a gear invented by thecelebrated James Watt as a substitute for the crank, and iscomposed of two spur gears in contact with each other,one of which remains stationary while the other revolvesaround it, the centre of the planet wheel being the onlypoint within it that revolves in a circular path, all otherpoints revolving in an eccentric path. The names sun andplanet are derived from their likeness to the solar systemin movement—the sun being stationary with the planetsrevolving around it. 12 HARDWARE AND METAL vogue, and from Mr. Barkers personalexperience it was found pleasant. Figure 7. is another method of producinga variable throw of the crank, so thatgreater leverage is obtained on the forwardthrow of the crank than on the backwardthrow, as seen in cut. Thisincreases the driving power atthe expense of what is knownas back pedaling and theinventor has managed to pre-serve the circular path of thepedal which, of course, is agreat ad
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Keywords: ., bookcentury1800, booksubjectbu, booksubjectimplementsutensilsetc
