To find out the crassitude or solid content of the cilinder or concaue of any peece.
First you must by the rules taught in the beginning of the booke, find out the content of the base or plaine of the concauity at the mouth of the peece, in multiplying ½, the diameter in halfe the circumference or else squa∣ring the diameter and multiplying that product by 11, and deuiding the result by 14, the quotient will also shew you the content, the which multiplied in the length of the cilinder of the peece, the product is your desire.
Example.
The Cannon aboue named of 7 inches diameter, wrought as is shewed, yeeldeth 38 inches ½ at the base or circular content of her mouth, which multiplied by 144 inches, the length of the cilinder, yeeldeth 8280 in∣ches, the solid content of the concaue of the said peece.
If you desire to know how many foote in square mea∣sure the solide content of the empty or hollow concauity of the peece aforenamed or any other doth containe, you must worke thus; deuide the number of inches in the solide content thereof by the number of inches in a foote square being 1728, the quotient is your desire.
Example.
The solide content of the peece of 7 inches diameter aboue named, containeth 8280 inches, which deuided by 1728, the quotient is 4 57/72, that is 5 feete in square measure wanting 15 inches. The like is to be done in any other peece, or in measuring the cilinder or Cone in any other solide body.