A bob-tailed arrow is thickest right behind the head, and tapers to the nock. A nock is a notch in the rearmost end of an arrow. The main purpose of a nock is to control the rotation of the arrow. In English it is common to say "nock an arrow" when one readies a shot. Arrows can be drawn over the shoulder rapidly by the nock. That is, the string goes directly to the nock in the strung (braced) position. Eastman associated the term with the ideas of the writer Albert Jay Nock. The double Wheel of Steel was invented by Wallenda and Nock. They have three children together including email Daredevil Annaliese Nock. O. S. Nock was more conservative at . Mike Nock (piano) and Eddie Marshall (drums). Engineering was done by Tim Bran (of Dreadzone) and David Nock. In 1776, the Board of Ordnance granted Nock, Jover & Co. In 1775, he formed Nock, Jover & Co. with William Jover and John Green. A nephew of Henry, Samuel Nock, was an apprentice under him.