Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 24
the pointsthus obtained, i- the helix required. A helical surfac I 1 by the revolution of a straight line round the a■..; of a c\ under; its irl moving in a helix, and the line itself forming with tie- axis • and invariabl lb- conical helix differs from the cylindrical one in that it is described ■… … 18 HORN. HEXAEDRON, fhe Ciihe. One of the five regular or Platonic bodies, and so called from its having-i\ faces. The square of the side or edge of a hexaedron is one-third of the square of the diameter ofthe circumscribing sphere ; and hence the diameter of a sphere is to the side of its…
Mechanical engineering
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