32~ Screw-like or Helical Motson.Since any displacement in a plane can berepresented in general by a rotation, it follows that the only combination of translation and rotation, in which a complex movement which is not a mere rotation is produced, occurs when there is a translation perpendicular to the plane and parallel to the axis of rotation. [Please select]
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The stirrer, agitated by a water motor, or, better still, a hot-air engine, has a series of helical blades curved to give a thorough mixing to the oil. [Please select]
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A powerful helical spring, turned out of a solid bar of steel, is compressed between the inside end of the piston and the upper end of the butt. [Please select]
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{Scanner's comment: Nowadays it is more correct to regard the corkscrew as helical and the watch spring as spiral. [Please select]
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Here things happen as in a first-class reed, for the helical curve in no way affects the method of structure employed for a rectilinear series of cells. [Please select]
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Is the half-fluid resin unsuitable for the wide-spanned roofs which would have to be constructed when the diameter of the helical passage exceeded certain limits. [Please select]
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