BAIRD &TATLOCK (LONDON) LTD. 



~ 



-D 



WATKINS 



HEAT 

 RECORDER 



5494 

 5493 T Mercury Steel Thermometer for temperature up to 950 C. 



Length of L . , 20 30 40 50 60 70 ' 80 in. 



Price .. 80/- 82/- 84/- 88/- 92/- 98/- 105/- each. 



5494 T Watkin's Heat Recorders. 



Consists of a small block of very refractory ware, having circular recesses sunk into its top face, into which 

 are placed little pellets of fusible materials of definite composition and melting point. The fusion point of each 

 mixture has been carefully and accurately determined by comparison with a Standard Electrical Pyrometer. 



Place the Recorders in the Oven or Kiln in such parts as desired while setting in, taking care to mark the 

 ends in under-glaze colour in such a manner as to indicate that position. 



I A. B. I A arch, B bottom, L left quarter. When fired examine carefully what alteration has taken place 

 '' | L. | in the form of the test pieces. 



It has been found from extensive experience that a range of 200 degrees C. will usually include the extremes 

 of temperatures which can be allowed in any well conducted firing operations. For this reason the Recorders 

 have been arranged in the following series, and opposite to each will be found an industrial firing operation for 

 which that particular one has already been found suitable : 



Series of Recorders most Suitable for different Glasses of Ovens and Kilns. 



992 



