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Caption: Mathematical Models Catalog of a Collection of Models of Ruled Surfaces
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14 44. Groin, Model showing the deformation of a common groin, both obliquely, and by splaying the vaults, The model shows not only the intersection, but the plans of the intersection and of the generating lines, 45. Helix or Screw-thread. Model showing the transformation of the right line generators of a right cylinder into screw threads of various pitch or obliquity. The pitch of a screw is the distance between two successive tarns, measured in a direction parallel to the axis. W h e n this distance is small, the screw is said to have a fine pitch, when great? a coarse pitch or high pitch.
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