method of reeving manila and wire rope blocks:

METHOD OF REEVING TACKLE BLOCKS
vary with the application and purpose for which they are to be employed. Especially on Heavy Lift Cargo Booms, Cranes, etc. where Blocks, with 4 Sheves or more are required, in which case a number of Lead Blocks have to be considered. Our Engineering Department will be glad to consult with you on this matter.

METHOD OF FIGURING "PARTS OF LINE"
L = E P	L = Load Lifted in pounds P = Line Pull in pounds E = Efficiency Factor
	To figure "Parts of Line" required when Load Lifted "L", and Line Pull "P" are known.
EXAMPLE: 32,000 lbs. (Load Lifted "L") = 5.3 6,000 lbs. (Line Pull "P") "E" factor of 5.3 in table indicates 6 "Parts of Line" required	Parts of Lines "E" Factor Brass Sheave "E" Factor Better Bearing 1 0.96 0.96 2 1.05 1.9 3 2.0 2.9 4 3.6 3.5 5 4.4 4.7 6 5.2 5.8 7 5.9 6.5 8 6.6 7.3 9 7.3 8.2 10 7.9 9.0 11 8.5 9.8 12 9.1 10.6