parabolic

Farther from the center they become parabolic, but they are quite good over the entire plate, 3¼ by 4¼ inches.

Its depth at the crown is 33 ft., and its centre line follows nearly the parabolic line of pressures.

In spans over 200 ft. it is economical to have one horizontal boom and one polygonal (approximately parabolic) boom.

The posterior are intermixed with round and square pieces, and the extremity of the armour near the tail is of a parabolic figure.

We use a small atomic cavity radiator at one end of which is a rough relux parabolic filter.