THE BOGARDUS ECCENTRIC MILLS. 



Applications have frequently been received for information on the subject of mills for grinding Cocoa- 

 nuts, and other substances. Through the kind offices of Mr. W. Griffin, of the firm of Messrs. Gillespie, 

 Bros. & Co., cuts have been obtained of the Bogardus Mills for publication in the Bulletin. The descriptions 

 are taken from the pamphlet on the mills published by the makers, Messrs. Simpson, Rodney St., Brooklyn, 

 from whom the mills can be obtained direct, or through Messrs. Gillespie Bros. & Co , 41 Beaver St., New York. 



Description of the Bogardus Eccentric Mills. 



The Bogardus Original Universal Eccentric Mills were first manufactured by the patentee whose name 

 they bear, about half a century ago, and at that time completely revolutionized milling industries. 



Mills are nearly the oldest machinery on record, and yet however varied their form, they have hitherto 

 been constructed on one uniform principle, namely : one stone or plate is stationary while the other revolves 

 and by its rapid revolution communicates a centrifugal force to the substance introduced between the plates, 

 wheieby all the material is thrown to the outer edges of the plate and the effective action is thus limited to 

 the smallest area and to the place furthest away from the motive power. 



In this Mill the principle is entirely new. Both plates revolve in the same direction (with nearly 

 equal speed) on centres which are apart from each other one or two inches more or less. The centre of one 

 or the axis thereto affixed resting or revolving upon a stationary bearing, whilst the prime mover by means of 

 a belt or geai'ing causes the motion of the other plates, whereby the substance to be ground is subjected to an 

 unlimited variety of twisting, wrenching, sliding and grinding mot ions in every direction over the entire 

 surface of both plates. 



The peculiar motion of the plates causes them of themselves to discharge the ground substance, so that 

 many substances can be ground by this mill which would altogether choke others. 



By the use of mills with one stationary and one revolviug plate the pressure increases with its distance 

 from the centre, being very much greater at the outer edge, consequently mills of larger sizes are necessary 

 than would be required if the pressure on the plates were equal over the sui-face, and greater power is needed 

 to operate them. The wear of such plates is confined to the outer edge, that of the greatest pressure, and the 

 period of their service is limited to the time the outer edge will endure. 



By the use of the Bogardus Mill the pressure is equal in every portion of the plate and their surfaces 

 wear uniformly, causing them to last much longer ; every portion of the surfaces of the plates from the centre 

 to the circumference is effective in grinding and much smaller mills are required for any given amount of work 

 than in single revolving plate mills. 



In mills with single revolving plates, one plate continually describes the same circle on the other, and 

 material ground in these mills is subject to motion in one direction only, and much greater power and time is 

 necessary to accomplish a desired result, than if the material were acted upon in various directions and by 

 different motion. 



In the Bogardus Mills one plate travels to the other in an infinite variety of directions over a surface 

 embraced between two eccentric circles apart from each other twice the distance that the centre of the plates 

 are apart, and the substance to be ground is moved about in every conceivable manner, and acted upon by 

 the plates at every point, and is subject to a peculiar wrenching, twisting, sliding, cutting, breaking and 

 grinding motion which rapidly disintegrates it with large results in quantity ground, using little power to 

 accomplish it. 



The everchanging action of the mills and the quick discharge ot the substance ground prevent the plates 

 from becoming heated, so that it may be profitably employed in grinding substances which in other mills 

 would be spoiled or deteriorated in quality, or which could not be ground on account of their melting. If 

 other mills were driven with the speed which can be applied to the Bogardus Mills, they would become red 

 hot in a few minutes. 



The Bogardus Mills have superseded the old stone mills, from the fact that it does away with the use of 

 a crusher, which must be used in connection with stone mills. The stones have to be re-cut every 4 to 8 

 days at great expense and a considerable loss of time, as the mills have to stand idle while this is being 

 dune ; while in the Bogardus Universal Eccentric Mills the plates last a long time, and can be replaced in 

 a few minutes at any time at light expense. 



The Bogardus Mills are more economical in the power required to drive them, and the labour to attend 

 them. They are less costly for the work they do, and more portable, and are capable of being applied to 

 purposes for which other mills are useless. 



The wear and tear are trifling. 



The plates are made in great variety to suit the purjtoses for which they are required. 



The Bogardus Mills are used for the following kinds of Grinding. 

 Nos. 3 and 4 Mills are used for grinding wet substances, such as paints in water, oil or varnish, printer's 

 ink, paste blacking, starch, chemical precipitates, and many other moist substances. 

 In Mills Nos. 3 and 4, the hopper revolves with the shaft, and acts as a mixer. 



Nob. 2 and 5 Mills are used for grinding dry substances, such as bones, raw and dried ; beans, castor ; 

 corn, (or cobb) ; coffee ; cocoa ; cocoanut ; cocoanut shells ; cotton seed ; gum ; ginger ; horns ; hoofs ; lime ; 

 oats ; phosphate, rock ; peas ; rocks ; roots, (of all kinds) ; shells, oyster ; sugar ; seeds ; spices ; stones ; wheat, 

 and all similar substances. 



Schedule of Prices of the Original Bogardus Patent Universal Eccentric Mills, with Patented Im- 

 provements. Terms — Cash. Draft for Mill must Accompany all Orders from Parties at a Distance. 

 These Mills have been thoroughly studied in every part ; are not liable to get out of order and in case of 

 accident are easily repaired at little expense. They are of the best workmanship and material, being now 

 made with tempered steel shaft, steps, etc., and all modern improvements. The same parts in mill of the 

 same size arc interchangeable, so that in ordering parts for repairs it is simply necessary to state the part 

 wanted, and it will fit accurately. For names of parts see sectional view. 



Ho. 1 Mill — not now in use. No. 4 Original Mill for grinding wetsubstances$360 00 



No. 2 Original Mill,forgrinuing<lry substances. $180 00 No. 5 Original Mill— " dry " . 390 00 

 No. 2 Improved Mill— " " " . 240 00 No. 5 Improved Mill— " « " . 610 00 



No, 3 Original Mill— " wet " . 15G 00 No. G Mill— not now in use. 



No, 8 Improved Mill — for grinding dry substances . $600 00 



