- Where h, k, are the
**pitches**of the two given screws. - It is to be noticed that the parameter c of the cylindroid is unaltered if the two
**pitches**h, k be increased by equal amounts; the only change is that all the**pitches**are increased by the same amount. - In particular cases the cylindroid may degenerate into a plane, the
**pitches**being then all equal. - 74~ Differential Screw.On the same axis let there be two screws of the respective
**pitches**Ps and p1, made in one piece, and rotating with the angular velocity a. - The whole state lies on the south-western exposure of a great roof whose crest, along the continental divide in western New Mexico,
**pitches**southward.

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