Popular science monthly . Fig. 2. A sort of pantograph-motion causesthe rear wheel of this skate to revolve them and to discharge the burnt the engines are inoperativethree-fourths of the time. Other self-[iropeled skates have been made alongsimilar lines, but driven by an electricmotor. These have, on the whole, beenmore successful. The second general t>pe is also self-propeling, but utilizes the weight of therider in some way to supply the drixingagency. The methods of doing this arelegion. Most of them depend on thefact that a man raises his foot in takinga step forwar
Popular science monthly . Fig. 2. A sort of pantograph-motion causesthe rear wheel of this skate to revolve them and to discharge the burnt the engines are inoperativethree-fourths of the time. Other self-[iropeled skates have been made alongsimilar lines, but driven by an electricmotor. These have, on the whole, beenmore successful. The second general t>pe is also self-propeling, but utilizes the weight of therider in some way to supply the drixingagency. The methods of doing this arelegion. Most of them depend on thefact that a man raises his foot in takinga step forward. In swinging his weightonto this foot he exerts downward pres-sure on his heel. The skate shown in 569 570 Popular Science Muiitlili/. Fig. 3. The spring onrear wheel must bewound up at each stroke Fig. lo has a ratk-and-pinion ar-rangement to takeadvantage of thisheel pressure. Soalso has the oneshown in Fig. 3,but with greatercomplication,since a springon the rearwheel must bewound up ateach springkeeps unwind-ing and is thussupposed to
Size: 1377px × 1815px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
