BAIRD &TATLOCK (LONDON) LTD. 



5214 



5214 1 Clarke's Calcitneter, for testing cement, slurry, limestone, etc. Price, as illustrated, 

 with special tables for pressure and temperature corrections and absorption 



DESCRIPTION. 



The essential points of this calcimeter are accuracy and celerity, and it therefore supplies a long-felt want 

 in the cement trade. 



The instrument consists of a large glass vessel of water G. B is a glass cylinder connected to a rubber ball 

 full of water F, and containing another graduated glass tube A. It will be thus seen that by compressing F by 

 means of screw-press H that water will rise in B and A. j is a glass bottle in which the gas is generated ; the 

 gas evolved passes down through the glass coil DD and then into the graduated tube A. c is a burette containing 

 HC1 of exactly the same temperature as the water contained in jar G. 



METHOD OF WORKING. 



The temperature of the water contained in G and the atmospheric pressure being known, the weight of slurry 

 as indicated by the Table supplied is placed in the bottle j with tube containing 10 c.c. of HC1 (Sp. Gr. 1.112) ; 

 after corking bottle on to tube L the whole lot is immersed into water in G, being supported by wire cage M. The 

 stopcock N is then opened, and the water in B and A is then raised to zero mark on tube A by means of compressing 

 ball F by means of screw-press H. The columns of water adjusted, the cock N is closed and the bottle taken from 

 water. Allow acid in K to come into contact with slurry, releasing ball F at the same time with left hand. The gas 

 evolved displaces the water in A, and care should be taken that ball F is released just fast enough to allow the levels 

 of water in A and B to get lowered at the same time, or else the water will be found to overflow in tube B. When 

 the action is complete the bottle is shaken in a circular motion for about thirty seconds to remove the last traces 

 of gas and then placed in cage M to cool for two minutes. The levels in both tubes are then adjusted till they 

 are equal, and the reading on tube A taken. This is then corrected for absorption, per Absorption Table supplied, 

 and the result obtained. 



The large jar of water affords a constant temperature throughout the whole operation, and it is therefore of 

 great advantage in assuring accurate results. 



Each Calcimeter is supplied with Table to give the weight of substance to be examined according to the 

 atmospheric pressure and temperature under which the instrument is working, and Absorption Table which is 

 calculated to give the amount of CO., absorbed and to make an allowance for any inaccuracy in the graduated 

 gas-measuring tube. 



5 15 



14 CROSS STREET HATTOTST GARDETST, E-C 



944 



