BAIRD &TATLOCK (LONDON) LTD. 



562V Set No. 5620 but with Calorimeter No. 5618, arranged for electrical firing 

 5622* Set No. 5620 but with Calorimeter No. 5619, arranged for electrical firing and mechanical 

 stirring 



COAL TESTING SETS INCLUDING CALORIMETERS. 



The sets of apparatus we offer are simple, practical, accurate, and complete. 



5623* Roland Wild Calorimeter with thermometer ; one sensitive balance reading to i milli- 

 i with knife edges and planes, pan arrestment and beam support ; m glass case with 

 levelling screws and box of weights in velvet-lined case with forceps, one Bunsen burner, 

 one desiccator two porcelain crucibles and lid, pair crucible tongs, three watch glasses, 

 two sieves wire for supporting crucible, copper oven with thermometer stand and burner, 

 mortar and pestle, camel hair brush, tweezers, scoop and glass measuring vessel of 1,000 

 cubic centimetres capacity, complete with instructions 



5624 T Roland Wild Calorimeter as above, but arranged for electrical firing . . 

 5625 T Roland Wild Calorimeter as above, but arranged for electrical firing and mechanical 



stirring, complete with instructions 



5626 T Sodium Peroxide in i Ib. tins (enough for about 36 tests) . . . . per Ib. 



5627 1 Sodium Peroxide put up in sealed tubes each containing sufficient for i test . . 



Brief Description of Instructions lor Roland Wild Calorimeters. 



The apparatus consists (see Fig. 5617) of a combustion chamber suspended from the cover by conduit which 

 is furnished with a valve There is a well-made copper water vessel inside an outer vessel, heavily mckelled, 

 forming an air jacket which effectually prevents radiation and absorption, thus rendering the rise in temperature 

 ol the water an absolutely true guide to the heat given off by the fuel. There is also provided a first quality Fahrenheit 

 thermometer the scale being divided into ^ths, and easily read in .frtto, and an agitating paddle or stirrer. 



(a) Place stated amount of water into water vessel, and of dried fuel, with proper amount of sodium peroxide 

 into the crucible, which screws firmly home. 



(b) Stir water until temperature is constant, and note same. 



Ic) Heat to redness a small piece of nickel wire, drop same through valve opening, and draw valve home ; 

 agitate water by stirrer. (If electrically fired, this is not necessary.) Note highest temperature. 



The rise in temperature multiplied by 1,000 = calorific value in B.Th.U. s of the coal. 



The calorific value + 967 = evaporative power per Ib. of the coal. 



Example. Water, 51 ; rise, 13.15 ; coal value, 13,150 B.Th.U. ; evaporative power per Ib., 13.6 (^i^). 

 Successive tests can be made with rapidity, thus enabling good average results of a. bulk of coal to be obtained. 



6 17 6 



876 



12 6 6 

 13 4 



14 14 

 036 

 050 



5628 



5628* Calorimeter, designed by Wm. Thomson, F.R.S. (See Journal of the Society of Chemical 



Industry, 29th November, 1886.) Price with platinum crucible and delicate thermometer 4 15 

 (Price subject to alteration in price of platinum.) 



5629 s Glass Jar for above, marked at 2,000 grammes . . . . . . . . each 066 



CROSS STREET HATTOTST GARDEN, 



1012 



