BAIRD &.TATLOCK (LONDON) LTD. 



8 I 



5107-5112 



Cement Testing Machines and Appliances, as used by the Admiralty, War Office, 

 Home, Indian, Colonial, and Foreign Governments, County and other Councils, Cement 

 Manufacturers, Railway and Harbour Works, Builders, Contractors, etc., etc. 



The aim in the construction of all these machines has been to secure the most accurate and undeniable results, 

 with absolute permanence and non-interference of the hand of the operator : thus, all spring and screws are 

 dispensed with, and the simple steel lever, and vernier (with weight attached), travelling on rollers, adopted ; 

 the vernier being traversed along the lever by a cord, passing over pulleys fixed to the standards, the hand not 

 touching or in any way affecting .the lever during testing. To make this more unquestionable, in addition to the 

 speed-reducing wheel and pinion, an automatic regulator can be added. 



There is no use made of either Water, Shot, Compound Levers, Spring Balances, Glass Tubes, or any other 

 objectionable parts, liable to give a multiplied error, or to break, or that is in any way uncertain and unreliable in 

 its action. They can at any time be easily tested for accuracy by simply hanging on any known weight (to the 

 top clip for holding briquette) and taking the reading of the vernier. 



The reading of these machines are in Ibs., but the lever can be divided into any scale or foreign measure 

 required. 



The shape of the briquette mould and clips is that of the British Standards Specifications form, but moulds, 

 etc., can be made to any design and to any size section required. 



INSTRUCTIONS FOR FIXING AND USING AUTOMATIC REGULATOR. 



The Automatic Regulator has been designed to give a uniform rate of travel to the vernier, so that all tests 

 are made at an equal number of Ibs. per minute, which the Engineering Standards Committee have fixed at 500 Ibs. ; 

 but this can be altered to any speed required by means of a cock in piston. It is also self-acting, and when test 

 is started, needs no interference whatever, and directly the briquette breaks the wire cord is held fast by means 

 of clutch, or break, until released. 



To fix the Automatic Regulator, fasten the brass tube to floor underneath the pulley marked 2, so that the 

 weight w just clears, and fill the tube with clear thin lubricating oil ; attach the long cord to left-hand side of 

 vernier, pass round pulley 4 on top of pillar A, and back and over pulley 2, down under pulley 5, and upwards 

 round No. i, and down again to loop at 5, attach the short cord to right-hand side of vernier, pass it over and 

 twice round the pulley 3 to prevent slipping, and attach ball hook. 



To use Automatic Regulator, see that vernier is at commencement of scale, then place briquette into its 

 place, tighten by the wheel R, until the strain is sufficient to lift the lever well above the zero line on standard 

 E, then hang on brass weight w, which will at once commence to move vernier along the lever ; see that the vernier 

 weight does not rock while travelling. To commence another test, remove weight w, lift lever by means of lifter, 

 which is fixed to standard E, then press on the cross handle at top of piston rod, which will let piston down gently, 

 and return vernier to commencement of scale, and proceed as already described. 



INSTRUCTIONS FOR MAKING BRIQUETTES. 



Mix the cement to be tested with as little water as possible, consistent with perfect homogeneity, and having 

 laid the mould on a flat surface, or on the iron plate supplied for the purpose, fill it with the cement as mixed, 

 pressing it well in with the spatula or trowel, and scrape the top flush. When set, take the briquette out of the 

 mould caiefully, and place it still on the flat plate in water for seven days, or for a longer or shorter period, as 

 required. It will then be ready for testing. 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



937 



