A Skipping Counter?
I cannot figure this one out. Does anybody have an idea?
Hot Flash! Jill used a 300.1 meter cal course - presumably not the same cal course Jack used. I think the culprit may be the 300 m cal course Jack used, and not a counter malfunction as Jack suspects. This needs to be checked. I have asked Jack to check and send me what he finds.
Best regards, Pete Riegel
Jack, a measurer, wrote;
“I measured a 5k course with a friend Jill. She obtained a length of 4998 meters while I obtained 4976 and 4980 meters. I was disturbed by the difference, as both of us are experienced riders.
Next day I decided to measure a half-mile (804.67 meters) calibration course as a check. I did a precal and a postcal on a local 300 meters, and did two measurements of the half mile. I obtained a length of 801.42 and 801.46 meters when I measured the half mile.
On day 1 my ride was 0.995 that of Jill’s, or Jill’s was 1.004 that of mine.
On day 2 my ride was 0.996 that of ½ mile, or ½ mile was 1.004 that of mine.
I cannot explain why my measurements seem to be less than they should be. Over the 16 calibration rides taken no apparent irregularity appears.”
Data are shown below.
Day 1
Jack’s calibrations on 300 meters
3074.5 3070.5
3075.5 3072
3073 3068.5
3075.5 3071
Measured lengths
Jack 4979.95 using 300 m cal course
Jack 4975.56 using 300 m cal course
Jill 4997.99 using 300.1 m cal course
Day 2
Jack’s calibrations on 300 meters
3074.5 3070.5
3075.5 3072
3073 3068.5
3075.5 3071
Average 3072.5625
Counts/m 10.241875
Half Mile Counts Length
start 65338
finish 73546.5 8208.5 801.46
start 81754.5 8208 801.42
Half mile = 804.672
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