530 Report of the Judges of Implements at Norwich. 
thatching. The amount of string used appears to be as nearly 
as possible 1 lb. per 100 feet run. Having a trial, we had the 
thatch made from ordinary trusses of straw from the thresher, 
and on completing a certain quantity, had it placed on to a 
stack prepared for the purpose close by. It was evident that 
the man was an adept at his business in the putting on, and he 
in a very short time covered a portion of the stack, pegged it, 
and completed the work in a most satisfactory manner. Ac- 
cording to our calculation, at a rough estimate, this man with 
the use of the machine could prepare and put on the thatch for 
eleven pence per square. And the thatch so knitted together, 
by the stitching and the lengths used with the ordinary pegging 
we saw applied, would, it appears, almost defy any wind to 
disturb it. The prize of 25Z. was awarded to this machine. 
The single exhibit entered in Class 4 calls for no remark. 
Messrs. Smith and Grace, No. 1339, Convertible Belt 
Pulley. — The principal feature of this patent is to enable the 
same pulley to be used for different sizes of shafting, and more per- 
lectly and easily fix the same without kerp ; this is accomplished 
in the following manner, which will be understood by reference 
to the sectional drawings (Fig. 1 — A to c) : — The holes of all 
rig. 1. — Illustrating MessiS. Smith and Grace's Convertible Belt 
Pulley, No, 1339. 
the pulleys are bored slightly taper, and screwed to a uniform 
size and gauge (a). A bush is inserted into the hole of the 
pulley to fit the size shaft for which the pulley is required ; 
the bushes are screwed externally to a uniform size and gauge. 
