250 The Tvolution of Agricultural Implements. 
conical fluted roller, the expressed butter-milk flowing away by 
a peripheral channel. From the butter-worker, the butter is 
removed in masses to a cold-air chamber, whence it is taken out 
as needed, weighed, and made up into pats of any required shape 
for the market. 
The machinery of a creamery is driven by a steam engine, 
whose power is, of course, determined by the amount of butter 
made per day. Steam from the boiler is conducted through all 
the rooms for the purpose of warming, evaporating, and heating. 
The cans and other apparatus are cleaned in the rinsing room, 
which is supplied with steam-heated water, and, in the best 
creameries, the floors are made of cement, laid with a slight 
slope so that they can be rapidly washed down with jets of 
water. 
It will be noted that the name of Salmon has recurred some- 
what often in the course of this paper, and, before passing away 
from the consideration of agricultural machinery proper to that 
of the accessory apparatus forming classes 7, 8, and 9, it is only 
right that a few moments should be spent in doing tardy 
justice to the memory of a very able mechanician, whose 
labours in the field under review have been of singular 
importance. 
Robert Salmon was for thirty years, or from 1790 to 1821, 
surveyor to the “ farming ” Duke of Bedford and his successor. 
It was the former Duke’s custom to hold a “ sheep-shearing ” 
annually at Woburn, and to make this the occasion for the ex- 
hibition of agricultural implements, for any meritorious novelties 
in which prizes were awarded. Mr. Salmon was a constant 
exhibitor of new inventions at these shows, and it will suffi- 
ciently demonstrate the high mechanical genius of the man 
shortly to catalogue his chief contributions to them. 
In 1 797 the Society of Arts awarded him 30 guineas for a 
chaff-cutting engine, the same machine as has already been 
referred to as the parent of all the modern chaff-cutters. At 
the “ sheep-shearing ” of 1801, Mr. Salmon exhibited his Bed- 
fordshire Drill, which became the model of all succeeding drills. 
In 1803 he showed a plough wherein the slade was replaced by 
a skew wheel, as in Pirie’s modern double-furrow plough. In 
1801‘ he brought out an excellent “ Scuffler,” or Cultivator. 
Two years later, in 1806, he exhibited a self-raking rea23ing 
machine ; but, the Duke of Bedford’s death having interfered for 
a time with the Woburn prize system, neither this im 2 :)lement, 
nor a threshing-machine shown with it, attracted any public 
