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Millimeters and Fractions

Compiled by L. A. Grosclaude, Geneva.

No. of turns spring is capable of developing. Theoretical No. Real No. 5 5 1/2 6 6 1/2 7 7 1/2 8 9 10 4 1/2 5 5 1/2 6 6 1/2 7 7 1/2 8 1/2 9 1/2 No. of coils the Spring makes in Spring makes in the barrel when run down. 8.92 9.81 10.70 11.60 12.49 13.38 14.27 16.06 17.84 Diameter of Barrel. Diameter of Arbor. Space occupied by Spring when run down. Length of Spring. Thickness of