> as lemmas

1877 W. C. Unwin Elem. Machine Design x. 223 The diameter of the smaller of two pulleys should not be less than about 18 times the belt thickness.

1915 Marine Engineer & Naval Architect Jan. 170/2 The belt thickness of the Iron Duke is..12 in. against the 14 in. of the König.

2007 Absolute Sound 172 112/1 How do minute variations in belt thickness affect the speed stability of 20 pounds of rotating mass?