from The Century Dictionary.
- noun Half a cylinder in longitudinal section.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Half of a
cylinder(cut along its axis)
from Wiktionary, Creative Commons Attribution/Share-Alike License
As each of these figures rotates, it traces a line on the surface of a semicylinder, which is perpendicular to the plane of ABDZ and has ABD as its base.
The boldness and the imagination of the construction lies in envisioning the intersection at point K of the line drawn by the rotating semicircle on the surface of the semicylinder with the line drawn by the rotating triangle on the same surface.
I made in former years such a research with regard to tuning forks of prismatic form, that is to say, of a constant rectangular section continuing even into the bent portion where the parallel branches are united by a semicylinder, at the middle of which is the wrought iron rod as well as the branches.