Of course, when I was taught how to measure a cone, I was also instructed to do the same with the frustum of one.
"The Boy Tar"
Mayne Reid
This gave the base of the hollow cylinder, which would be equal to the frustum of a cone of like altitude; and another multiplication by the length produced the entire cubic content.
"The Boy Tar"
Mayne Reid
By this time Tidor, the neophyte, had edged his way past the flank of Urim's guards, slipping stealthily from sight behind the frustum.
"Warrior of the Dawn"
Howard Carleton Browne