AIR-POWERED SPEEDOMETER (Dec, 1958)
AIR-POWERED SPEEDOMETER
for bikes made by the Sinko Mfg. and Tool Co., Chicago sells for $1.89. As bike moves, air enters intake, deflects small fan blade on a spring-mounted needle.
January 2, 2007
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I had one of this when I was a kid and they were fairly accurate, as long as you didn’t have a head or tail wind.
Comment by Bayard — May 23, 2010 @ 4:46 pm