If the generatrix makes an angle θ to the axis, then the aperture is 2θ.

That it was Maximus's sword which Merlin found for Arthur and fixed in the stone of Lludyn's Hill by magic arts so that none but he who was rightwise born King of all the Britons could pull it out.

Another innovative metal form was the “ice-cream” chair, so called because its portability and inexpensiveness made it practical for use in luncheonettes and ice-cream parlors everywhere.

Here you see the torch of Althaea, the avengeress; she was a good sister, but a bad mother.