wheel came into being in the 60's which made it easy estimate distance
along a road. Vern did use in going across fields but it slipped a lot
and got caught in weeds. The first device had a larger wheel than that
show left. the only reason for a smaller wheel would be that it stored
better when not in use.
recorded in tumbler type meter which is tripped each time a pin, mounted
to the side of wheel, passed the meter. Vern's wheel was designed to be
exactly five feet around, measured at the outer surface of the wheel.
that came up included: Handle folding down because tightening device wore
out, or pins marking each foot on wheel would be displaced, or tripping
handle on meter would not stay tight, or going too fast the wheel would
bounce and skip. Vern would quite often wheel the distance more that
once to be sure they were measured correct.