There are two change gears in the lay combination, the Reversing Shaft Change Gear Z2 and the Lay Change Gear W1. Although we have given the full list of Lay Gearing in the above table, only the gears marked * are variable, the others being the same for all frames. The regular change gear is W1 and the table on the next page gives lay constants for a range of Reversing Shaft Change Gears Z2 from 14 to 22 inclusive. To find the correct lay constant select the proper [{135}] Lay Gearing Combination from the nine given above, note the number of teeth on the Reversing Shaft Change Gear Z2 and take the constant which corresponds in the table below. For example, the lay constant for a frame with gearing like No.4 combination and a 16 T. Reversing Shaft Change Gear is 437.9. This divided by the number of teeth on the Lay Change Gear W1 will give the laps per inch on the bobbin.
TABLE OF LAY CONSTANTS FOR GEARING COMBINATIONS No.1, No.9 AND REVERSING SHAFT CHANGE GEARS 14 TO 22 T.
ROVING TABLE.
FOR NUMBERING BY THE WEIGHT, IN GRAINS, OF 12 YARDS; AND SHOWING TWIST PER INCH.
(Square Root X 1. 20)
