I don't think you can measure the experimental perforations that precisely. If you look at the image of my stamp you can easily see the perforations are not evenly spaced or cleanly cut. Bogg's lists three types of perforation applied to the stamps.
Hyphen-hole used about 1855, Sewimg Machine used about 1857, and Sawtooth roulette vertcally used about 1857.
I think the perforation 14 measurement is more an approximation/average measurement than a precision measurement.
They approximate slightly over 14 though the spacing is imprecise. The perf 14 stamp is known on cover too, to the printers in Montreal. They are prized, rarely change hands, and seldom see public auction.
Fred Jarrett in his book "Stamps of British North America" also mentions several different ones on pages 17-20 and 26
It appears that the perforator used for the holes was a stroke perforator made by the Ontario Foundry Company, Kingston set at around 18 pins/holes per inch (14+ perfs per 2 cm) even though they may not have been fully equally spaced.
Inferred Kiusalas 14-56 would be 0.056" between perforation holes which is around 14.06 perfs per 2 cm.
U.K. stamps were perforated 14 around that time since in January 1855, the perforation gauge was changed from 16 to 14 as it was found that the sheets were coming apart too easily.
Were some Canadian stamps sent to the U.K. to be experimentally perforated? (Just realized the U.K. stamps were comb perforated and these Canadian stamps were line perforated.)