BAIRD &TATLOCK: (LONDON) LTD. 



6272 6272 (Open for cleaning). 



6272 Sturtevant Laboratory Grinder . . . . . . . . . . . . 24 15 



This is adapted for grinding ore taken from laboratory roll, or from mortar, reducing it at once to practically 

 any degree of fineness for perfect sampling and correct assaying. 



The grinding is done between manganese steel or built-up corundum discs, easily and cheaply replaced ; the 

 i output being regulated by the hand-wheel to deliver a coarse or fine product as desired. 



The grinder weighs about 175 Ibs., requires about 3 H.P. to run to full capacity, speed 750 to 800 R.P.M. 

 I Pulley 7 in. diameter by 3! in. 



Dimensions length 27 in., width 15 in., height 16 in. 



When these machines were first used on coarse and very cutting ores, the grinding plates would score or ring, 

 after which the output became uneven in character and reduced in quantity, and this long before the grinding 

 1 plates were worn out. 



This has been remedied by arranging the stationary disc or grinding plate so that it can be moved frequently 

 from its centre, thus changing the relative positions of the two grinding surfaces, so that all cuts, scores, or rings 

 [made in the faces may grind themselves out. Fine and even grinding is thus assured. 



We would call special attention to the ease and rapidity with which these machines can be cleaned. The door 

 I latch is raised and the door swung open. Not even a bolt is removed to give full access to the interior. 



i 



6273 



i273 T Sturtevant Laboratory Screen 



This screen has been designed lor laboratory use and may be run either by hand or power. Every part is 

 iccessible for quick and thorough cleaning. It can be set upon any suitable bench or on the floor, and has a 

 capacity of from 100 to 1,000 Ibs. per hour ; it is as nearly dust-proof as any device of its class. Weight, net, 

 55 Ibs., width 21 in , length 42 in. .height 27 in., pulley i8in. by ijin. 



22 10 



CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



1149 



