BAIRD &.TATLOCK (LONDON) LTD. 



Uai 



5095-5106 



Cement Testing Machine, British standard pattern. 



This apparatus consists of a japanned cast-iron column, which carries two levers, the combined leverage of 

 which is i to 50 that of the longer being i to 10, and that of the shorter i to 5. 



Each lever has three hardened steel knife edges acting upon hardened steel concave bearings, so that an 

 extremely accurate balance is obtained. 



The short arm of the upper lever is provided with a movable counterpoise, to secure the correct position of 

 the levers, which is indicated by a mark on the upright catch at the top of the column. At the extremity of the 

 long arm is suspended a small brass frame to carry the shot bucket. 



On the lower lever, near its fulcrum, is suspended the upper clamp or clip for holding the briquettes. The 

 lower clamp is fixed to the base of the column and adjusted by means of a screw. 



To make a test, the cement briquette is taken out of the water, dried, and put into the clamps, which must be 

 accurately applied to the sides of the briquette, and the screw applied until the upper edge of the long lever is 

 opposite the mark on the upright catch. Fine shot is then poured from the self-acting short-run into the bucket 

 suspended from the long lever until the briquette breaks, when the supply of shot is instantly cut off. The breaking 

 strain per square inch is thus exactly fifty times the weight of the bucket and shot ; but to avoid all calculation and 

 possible risk of error, a spring balance with a special dial is supplied, upon which the bucket and shot are weighed 

 and the exact breaking strain of the briquette at once shown. 



All parts of the apparatus are highly finished, the polished iron and steel portions being nickel-plated to 

 prevent rusting, if exposed to damp. 



5095 T Double lever machine 



5096 T Automatic shot-run, bucket and stand 



5097 T 12 Ibs. shot ...... 



5098 T English spring balance 



5099 T 6 brass moulds of i square inch section with springs . . 



5100 T 6 ,, held together with screws 



5101 1 Spatula with knife 



5J02 T Can ...... 



5103 T 6 iron plates for moulds . . 



5104 T Brass sieve boxes with 5,776 and 32,400 meshes per square in., 4^ in. diameter . . 



5105 T i brass sieve box ,, ,, 6 in. 



5106 T 2 sieves, 400 and 900 meshes per square in. for the standard sand 







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93 fi 



