PATENTS. 



617 



larly adapted to drawing down, swaging, and 

 \velding. 



The original invention was made by Bonnet 

 Ilotrhkiss, and patented in 1859, and improve 

 ments on the same were patented by him, July 

 2, 180:3, and May 3, 1864. 



LARD. Improvement in the manufacture of. 

 It is a common practice to extract the fatty 

 matters from refuse and scraps by a steam di- 

 gester, but it is found that lard or tallow pro- 

 duced in this way, is not as pure and marketable 

 as when extracted by fire heat in an open pan. 

 George B. Turrell of New York City, has in- 

 vented and patented, June 28, 1864, an appa- 

 ratus for treating lard, tallow, &c., which ren- 

 ders steam-tried fats as pure and marketable as 

 those tried out by fire heat; this apparatus 

 consists in a range of horizontal pipes, one above 

 another ; the upper pipes of this range are heat- 

 ed by steam, while the lower pipes are cooled 

 by a stream of water passing through them. 

 The lard or tallow flows from the edge of a 

 trough upon the top pipe of the range, and from 

 one to another until it reaches the bottom. The 

 heat of the upper pipes in this range of pipes, 

 drives off impurities, and the air comes in con- 

 tact with the thin stratum of heated fat for its 

 purification ; the lard is cooled by passing over 

 the pipes in the lower portion of the apparatus, 



and is received into a trough at the bottom 

 ready for packing. 



AMALGAMATOB FOR GOLD ORE. One of the 

 most common amalgamators is an iron pan 

 into which the pulverized ore and water 

 pass, and in this pan a pah- of mullers travel 

 around to rub and grind the fine particles 

 of gold so that they may amalgamate with 

 the mercury in the bottom of the pan. The 

 revolution of these mullers produces a centri- 

 fugal action in the water, causing it to bo 

 highest at the outer edge, and hence the hea- 

 vier metallic particles are more liable to escape 

 with the tailings. Joseph Kenyon, of Black 

 Hawk, Colorado, has invented an amalgamator 

 which was patented July 19, 1864, and of 

 which the cut below is a representation. The 

 mullers are set on arms from shafts, upon which 

 are pinions, taking the teeth of a stationary 

 gear-wheel, so that the mullers are revolved 

 upon their own shafts as those shafts are car- 

 ried around by a revolving cross head. This 

 apparatus is in practical operation to advantage 

 in Colorado, and it is found that the mullers 

 travelling in a cycloidal curve counteract the 

 centrifugal action on the water, so that the 

 metallic particles are not thrown off, and the 

 amalgamation is rendered much more perfect 

 than in the amalgamators heretofore employed. 



KENYOX'S GOLD AMALGAMATOR 



