generatrices

There are three of them in the direction of the generatrices of the cylinder, and this makes a total of 24.

Scientific American Supplement, No. 441, June 14, 1884. Various

The gun is placed under a vault whose generatrices are at right angles to the line of fire (Fig. 8), and which contains a niche that traverses the parapet.

Scientific American Supplement, No. 531, March 6, 1886 Various

Next, a few revolutions of the winches that control the screws suffice to lower the upper cylinder to the exact position limited by the contact screws, P, and the bar is rolled between the two cylinder tables with a constant velocity in the generatrices.

Scientific American Supplement, No. 362, December 9, 1882 Various