BAIRD ^TATLOCK (LONDON) LTD. 





w 



5190-5196 

 Cement Testing Machine, Sailer's Improved Pattern. 



This apparatus has now been improved and revised so as to meet the requirements ot the British Standard 

 Specification for Cement Testing, and it will be found as perfect a machine as can be devised for the purpose. 



It also has been increased in strength, and the bucket, shot-run and scales made suitable for weights up to 

 1,200 Ibs., as owing to the recent great improvements in the manufacture of cement, it is now no unusual thing 

 to find neat tensile tests going 900 to 1,000 Ibs. on the square inch at seven days, and of course still more than that 

 at longer dates. 



The shape of the clips is in accordance with Standard requirements, and these are sufficiently massive to 

 require no cross stays. As the speed of the shot feed is now standardised, a can for hand feed is not supplied. 

 The speed of the shot can be adjusted to 450 or 500 Ibs. per minute. With the former speed, as the bucket weighs 

 50 Ibs., it makes up a total load of 500 Ibs. on the briquette in the first minute. It is better to use this speed 

 with a sand briquette, but if the briquette is neat and the test is likely to be considerably over 500 Ibs., it had 

 better be set to the speed at the 500 Ibs. mark. 



The apparatus consists of a japanned cast-iron column, carrying a pair of compound levers, having a combined 

 leverage of 50 to i. The levers are fitted with tempered steel knife edges, which rest on polished concave bearings, 

 also of tempered steel, thus obtaining a very sensitive balance. A sliding balance weight for the purpose of setting 

 the levers in equilibrium, is fitted to the upper lever. The upper clamp, to receive the cement briquette, is sus- 

 pended from a knife edge on the lower lever ; the lower clamp is attached to the base of the column, 

 and is adjustable by means of a screw and a small hand wheel. The supply of shot to the bucket is automatically 

 cut off at the moment the briquette breaks. 



To use the machine, set the levers " floating " by means of the sliding balance weight w. Once set tightly 

 this need not be touched. If, however, it is desired to start the load from zero, this weight can be adjusted to 

 balance the weight of the can by running it out to the end of the lever. In that case either 50 Ibs. must be deducted 

 from the scale when weighing the shot and can, or to save this calculation the pointer of the balance can be adjusted 

 by the screw for that purpose so as to stand at zero with the weight of the can, and in that case the pointer will 

 give the weight of shot only. 



The briquette is next removed from its tank, wiped with a cloth and placed in the clamps, centrally and 

 flush with the sides. 



Hang the bucket on the bridle (B), and screw up the hand wheel until the top side of the lever from which 

 the shot can is suspended is about half an inch from the top of the guide at c. This then allows ample downward 

 movement, if the clips slide up the briquette as the load increases, and prevents the lever touching the bottom 

 of the guide at (D) before rupture and avoids the necessity of stopping the machine to screw up the wheel (E) again. 



As soon as all is ready and all the knife edges are seen to rest square in their bearings, depress the handle 

 (H) to the first notch. If starting from zero the shot should be adjusted to run at the 500 Ibs. per minute. 



As soon as the briquette breaks, the bucket falls on to the rubber pad and depresses the lever (F), by which 

 the shutter (s) is released, and so cuts off the supply of shot. All shot must be the same size No. 6 by preference. 



The bucket is then removed and placed on the spring balance, by which the breaking load is at once indicated 

 without calculation. 



If by any chance the shot should hang up from any cause, the container should be tapped. 



The machine is tested to extreme accuracy by dead weight before leaving the works. 



The apparatus will test with equal correctness any load from J Ib. up to 1,200. 



After use the machine should be at once rubbed down with a dry soft cloth and put under cover. 



ICHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



