Fig. 18A shows the wedge reinforcement. This was firstmade from horn; later, fiber was found to be tougher. In Fig.18B we see the simple reinforcement made by sawing a slotin the arrow and gluing a piece of sheet fibre in the slot. Thismakes a good nock.
Fig. 18C illustrates the latest construction. This is a separatenock, die cast from a cellulous plastic. It has a tapered holeinto which the shaft is fitted and cemented on with a cel-lulous cement. It is tough. It comes in almost any desiredcolor. It is easily replaced. If a nock is broken, all one has todo to replace it is to set it afire and it will burn off cleanlywithout damaging the wood; then another nock can be ce-mented on and in 20 minutes it is ready for use. For huntingarrows, these nocks are cast with a small knob on the cockfeather side which enables the hunter to "feel" the arrow on
