Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 169
The motor is mounted on aswinging bracket, and automatic control isprovided by swivelling the motor and hemi-sphere about a vertical axis (through thegeometric centre of spherical surface), thusbringing a greater or less arc of the hemi-sphere in contact with the tyre. The swivel-ling motion is…
Electrical engineering
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