The Roman Iron Industry in Britain by Sim David;

Author:Sim, David;
Language: eng
Format: epub
ISBN: 897617
Publisher: The History Press
Published: 2012-11-12T05:00:00+00:00

The bolt head (square pyramid)

The catapult-bolt head manufactured in this experiment was based on an example illustrated by Manning (1985 V144, pl. 80). This is a common type, with a pyramid-shaped point and a tapering socket (colour plate 18). A length of bar was heated to a yellow-red heat (950°C), and one end flared into a fantail shape (30a). A further heat was taken to the same temperature as before, and the head was cut off the bar with a hot set (30b). In one heat, the pyramid point was forged to shape (30c). Using a bottom swage and the cross pein end of the hammer, the socket was partly formed and then closed over a mandril on the anvil using the hammer (30d). When the metal had cooled down to black-red heat, the point was hammered to impart a smooth surface finish. As with the flat blade type weapons, this method of manufacture was simple and involved little loss of material. Three bolt heads were made in an average time of 53 minutes (Table 6).

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