60 AGRICULTURAL ENGINES. 



sent their corn produce to him to be thrashed; the grain was 

 measured, the tenth taken out, the remainder returned to the 

 farmer. The three-way cock, which worked the engine, was 

 joined in its shell ; on freeing it the engine continued to work 

 very well." l 



" In 1818 I put a new four-way cock to a thrashing engine 

 that Captain Trevithick had made for Mr. Kendal, of Padstovv, 

 who was the receiver of tithe corn. The boiler was a tube of 

 wrought iron, about 4 feet in diameter and 6 feet long, standing 

 on its end. The cylinder was fixed in the top of the boiler ; an 

 upright from the top of the cylinder supported the fly-wheel 

 shaft; a connecting rod from the crank-pin in the fly-wheel 

 was fastened to a joint-pin in the piston. The cylinder had no 

 cover. The four- way cock was worked by an excentric on the 

 shaft, moving a lever, which was kept in contact with the ex- 

 centric by a spring." 2 



" About 1824 I worked in Binner Downs Mine one of Captain 

 Trevithick's puffer whim-engines. The boiler was cylindrical, 

 made of wrought iron. It stood on its end, with the fire under 

 it, and brick flues around it. The cylinder was let down into 

 the top of the boiler. A four-way cock near the top of the 

 cylinder turned the steam on and off. The fly-wheel and 

 its shaft were fixed just over the cylinder. A lever and rod 

 worked the four- way cock and feed-pole. The waste steam 

 puffed through a launder into the feed-cistern. The cylinder 

 was about 12 inches in diameter, with a 3-feet stroke." 3 



Mr. Kendal's steam thrashing machine remained at 

 work at least six years, during which time the only 

 apparent repair was the four-way cock, worked by an 

 excentric, which, if neglected, was apt to stick fast in 

 its shell. 



One of the puffer-whims erected about this time was 

 similar to the thrashing engine for Padstow, differing 

 from the earlier one made for Sir 0. Hawkins, in 



1 Captain Samuel Grote's recollections, 1858. 



2 Recollections of Captain H. A. Artha, Penzance, 1868. 



8 Eecollections of Henry Vivian, Harvey and Co.'s Works, 1869. 



