Excellent as that is my point. 12 bore, or any for that matter, was never 0.729" or a numeric value. Even the 0.577 is noted as having a bullet diameter of 23 to the pound. A numeric value was a forced definition when folk were able to make that measurement and the truncation of pi was yet another avenue for the interjection of error w/ all the other error. And until the standardization of units, etc. such a value couldn't be accurately measured. If one had 12 spheres of pure lead totally 1 pound, measured the diameter of all and took an average, that would be a close approximation of what the diameter would be. It wasn't until the last 1880s that pi was determined to be transcendental and then in 1897 there was an attempt by lawmakers in Indiana(from memory) to set the numeric value of pi to 3.2. But in the 19th century there were many digits for pi, but how many sig-figs did the early folk doing the computing use(maybe just a fraction equivalent?). The difference is really only in the thousandth range. About a dozen digits are needed for such a computation. In the mid to late 1990s, I was fortunate to see experiments calculating the value of pi out to millions of places via the Cray.
(rad. in feet)^3=3/(4*pi*708(density of lead in lb/feet^3)*gauge)
always, always remember to convert from inches to feet & feet to inches which is yet another source of error. Us US foot and not international.
In metric:
(diameter)^3 =(6*453.59237)/((11.352 g/cm^3)*gauge*pi)
Kind Regards,
Raimey
rse
Last edited by ellenbr; 05/24/08 06:18 PM.
