726 Repovt on the Exhibition of Implements, 
■| inch to 7 inches diameter, this is really an: impartant improvement ; and 
the economy of the manufacture enables the article to be sold at a considerable 
reduction in price. Thus the price per cwt. ranges in iron'from 12s. 6d. to 
19s., and in steel from 16s. 6d. to 17s. 6d. In the latter material, 4^ diameter 
is the largest size made. The price of K M Kirkstall bars is 71. 10s. a ton, 
whereas the same quality of iron in patent roller would be 12?. 10s. 
J/r. Henry Brinsmead, of Ipswich, received first-class mention 
for a novel construction of straw-shakers. The main feature is 
the use of only one crank, which is placed in the centre under 
the shakers. Each shaker is in two parts, jointed over the 
crank. This arrangement produces the same effect as a double 
lift. The wear and tear on the crank is greatly reduced by 
springs under the backbone of each shaker, which accumulates 
the power and gives it out. This plan secures the same effect at 
both ends that others with a single crank do at one. It is stated 
by the exhibitor that this shaker has 50 per cent, more throic 
than any other. Price 357. I regret that I am not able to give 
accurate illustrations, as !Mr. Brinsmead's patents were not in a 
sufficiently secured condition to make full publication desirable. 
Fig. 21. — Mr. Henry JBrinsmeacV s Patent Douhle-adlon Strmc-shalcer. 
Numerous specialities in the w ay of drum-guards, which are 
now a necessary adjunct to every threshing-machine,* were 
shown at Kilburn, and of these the judges selected two for first- 
class mention. The first of these to be noted is Hunt's patent 
drum-guard, exhibited by Geo. H. Innes, of Royston. 
The nature of this invention will be understood by the following dra^viugs, 
in which Fig. 22 gives a section of the guard, showing the mouth of the drum 
open for feeding. Fig. 23 shows the drum covered by the slide ; and Fig. 24 
gives a plan by which it will be seen that the side-boards, &c., are so connected 
with the feed-board that pressure on any part sets free the slide. 
The principle is very similar to that of an ordinary mouse-trap. The slide 
is connected by means of iron rods on either side with strong springs, con- 
tained in two tubes attached to the sides of the feed box, and seen in Fig. 24. 
The slide is drawn back and retained in its place by a lever, one end of which 
♦ An Act of Parliament, passed April 16th, 1878, and which came into opera- 
tion on August 1st last, imposes a penalty of 5?. on every person using a machine 
without a proper and sufficient guard. 
