Award of Medals, Sfc. at Kilhurn. 
735 
fo. in 2. Second-Class Mention. 
Catalogue. 
4131 M. Francois L'Heron, for Agricultural BaiTow. 
6927 Pulsometcr Engineering Company, for Centrifugal Grinding and Sift- 
ing Mill 
7368 Messrs. Entwisle and Kenyon, for Riley's Patent Engineer's Vice. 
9056 Messrs. Everett, Adams, and Co., for Patent Double-row Turnip 
Thinner. 
9144 M. Nicolas Noel, for Valve attached to Pump. 
9714 Mr. Thomas Adams, for Patent Spring Safety- Valve. 
Messrs. J. Sabatier and Co., of Bread Street Hill, London, 
showed M. Fran{}ois L'Heron's universal barrow, for which are 
claimed special advantages. The shafts are high, and therefore 
the workman is not obliged to stoop. Part of the load bearing 
directly on the wheel, some considerable portion of the weight, 
said by the inventors to be 30 per cent., is thus saved. When 
unloading, the load is thrown forward over the wheel, and the 
load automatically opens the front flap, and is discharged, thus 
saving the trouble of turning the barrow over on one side, 
which is dangerous, and likewise requires more room. This 
article was not entered in the catalogue, and therefore I have no 
knowledge of the relative cost. That there is some advantage 
in the position of the load over the wheel and the mode of dis- 
charging is evident ; and if equal strength without undue cost is 
obtained, this is a creditable invention. 
The Piilsometer Engineering Compang, of Queen Victoria 
Street, London, exhibited a complete novelty in their com- 
minutor (Thompson's patent), a centrifugal grinding and sifting 
mill. The nature of the machine will be understood by refe- 
rence to the sectional view (Fig. 29, p. 736). 
The grinding is effected by the centrifugal action of the ball, 
which revolves with the spindle, and the revolutions of the 
discs. The spindle, which is driven at a high speed, when 
rotating carries with it the discs and the ball. The material to 
be ground or pulverized is placed in the external hopper, seen 
on the left side of the section, and fed from thence according to 
its nature, and by a controllable feed, into the cups of an annular 
elevator, by which it is raised and discharged into the internal 
hopper, from which it falls into the mill hy double apertures ; 
It is first crushed by the rapid blows of the ball, which freely 
exerts its centrifugal force upon the materials under operation ; 
and by means of a simple rolling motion kept up by the discs 
the whole becomes rapidly pulverized, and is then, through the 
fans of each disc, raised out of the mill and falls into the sieve, 
through the meshes of which the fine flour escapes, whilst the 
coarser materials are brought back to the elevator, to be again 
