A Driving Pulley, 8 in. to 18 in. dia., advancing by 1/2 in. increments; 3-1/4 in. face.
A1 Cylinder Gear, 17, 21, 29 and 39 T.
A2 Cylinder, 7 in. dia.
B Jack Gear, 72, 76, 86, 96 and 106 T.
B1 Twist Change Gear, 25-67 T., advancing by one tooth.
C Intermediate Gear, 156 T. for 36-in. frame; 171 T. for 39 in. frame.
C1 Builder Motion Driving Sprocket Gear, 8 T.
D Front Roll Twist Gear, 84 T.
D1 Front Roll Draft Gear, 21 and 27 T.
D2 Front Roll, usually 1 in. dia.; sometimes 1-1/16 in. dia. and 1-7/8 in. dia.
E Crown Gear, 72, 90 and 108 T.
E1 Draft Change Gear, 32-59 T., advancing by one tooth.
F Large Back Roll Gear, 79 and 89 T.
F1 Small Back Roll Gear, 28 T. for 7/8 in. dia. Middle and Back Rolls, 29 T. for 15/16 in. dia. Middle Roll, 1-1/16 in. dia. Back Rolls.
F2 Back Roll, usually 7/8 in. dia., sometimes 11/16 in. dia. and 1-1/8 in. dia.
G Broad Middle Roll Intermediate Gear, 48 T.
H Middle Roll Gear, 26 T. for 7/8 in. dia. Middle and Back Rolls, 24 T. for 15/16 in. dia. Middle and 1-1/16 in. dia. Back Rolls.
I Whorl, 3/4 in., 13/16 in. and 7/8 in. dia.
J Carrier Sprocket Gear, 10 T.
K Builder Motion Worm Shaft Sprocket Gear, 12, 14, 16, 18, 20, 22 and 24 T., dependent upon the Number of Yarn.
L Carrier Sprocket Gear, 7 T.

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SPINNING FRAMES.

DRAFT CALCULATIONS.
TWIST CALCULATIONS.

When figuring the Ratio of Whirl Speed to Cylinder Speed we add 1/3 inch to the diameters to allow for the band.

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In our production tables on [pages 156 to 159], the allowance for doffing, waste, etc., varies with the numbers of yarn, the percentage loss being greater for coarse than fine work.

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