Remarks on Wheels.
REMARKS ON WHEELS.
In all articles of the wheel kind, the Tyro must observe to increase the strength of his composition for cases, as his wheels increase in diameter; for a rocket proper for a twenty-four inch wheel will not do well for one that is much larger.
The following rule as to this particular may serve in many cases: divide the diameter of your wheels, taken in inches, into three parts, and it will give the length of your cases, and generally within one, the number it will require to go round it. Thus suppose your wheel is twenty-four inches diameter, divide by 3; 24/3 equals 8, which is about the length of your cases: and 7 : 22 :: 24 : 528 which divided 528/7 = 75,3 and 75/8 = 10 equal 10, the number of eight-inch cases it will take to go round the circumference.
This is not given as a particular, but as a general rule; or one that will assist a little in the arrangement of these articles.