Hello,
I'm looking for the dimensions of pre-1964 coin blanks, the circumference and height specifically. What started out as a simple/not-so-simple math question: Find the weight of a 1964 Kennedy Half Dollar using the density of silver and copper, and it's radius and height. Fairly straight forward, all the info you need to solve the problem is easily found with a quick Google search.
Density of Silver: 10.49 g/cm^3
Density of Copper: 8.94 g/cm^3
Volume of the 1964 Kennedy: 1.58cm^3 = 3.14156*15.31*15.31*2.15 = 1583.2mm^3 = 1.5832cm^3
Weight/Mass(Earth) then comes down to the formula Mass = Density x Volume: 1.5832*0.9*10.49 + 1.5832*0.1*8.96 = 14.947+1.485 = 16.365g
So the weight of a 1964 Kennedy Half Dollar is 16.365g. Except it's not, it's 12.5g. Turns out the math is right, but the inputs were not.
Sooo... I need to find the dimensions of the blanks used to produce the 1964 Kennedy Half Dollars. And that has not been an easy Google search. Can anyone tell me what the dimensions of the blanks used to produce the pre-1964 coinage is and the source?
Thanks