Load, lbs. / 1120 = Breaking strength of teeth.

Load, lbs. / 280 = Strength for very low speeds, and for steady work ; being 4 times the breaking strength.

Load, lbs. / 140:= Strength for ordinary purposes of machinery; being 8 times the breaking strength.

Load, lbs. / 100 = Strength for high speeds and irregular work ; or when the teeth are exposed to shocks.

As before,

Strength Strength .

---------------- = Breadth, ins. √------------------ = Pitch, ins.

(Pitch, ins.)2 Breadth, ins.