No. 54 949. 



Pyrometers. 



587 



54 945. 1 = 5. 



54 943. 1 : 4. 



54948. 1:8. 



54 949. 1 : 8. 



:>!.!;>. Compensator for connecting the Measuring Arrangement to a 110 volt D. C. Power 

 Supply, Figure 



54.939. - - idem, for 220 volts D. C 



54.940. Double Strand, the resistance of which is taken into account during the adjustment. 

 In lengths to 30 m 0. 1. 6 to 



54.941. Optical Pyrometer after Wanner (Photometer), Figure, for measuring tempe- 

 ratures from 840 to 2000 C., with regulating resistance, adjusting device and battery 

 of accumulators 



54.942. - - idem, with direct reading for temperature 



54.943. Optical Pyrometer after Wanner (Photometer), for temperatures from 900 C. to 4000 C. 



54.944. - - idem, with direct temperature reading, Figure 



54.945. Pyrometer after Wedgwood, Figure, for Determining high Temperatures in 

 accordance with the concretion of clay cylinders exposed to the heat, with 12 plate 

 cylinders (Fr. phys. Techn. I., 2, Fig. 3054) 



54.946. Clay Cylinders for above Per dozen , 



54.947. Seger Cones, one set (20) 590 1850 C 



54.948. Water Pyrometer after Siemens, Figure, for temperatures to 1,000 C. with thermo- 

 meter and six copper cylinders each of 137 grammes weight . 



One of the copper cylinders is inserted into the furnace space, the temperature of which it is 

 desired to measure, until such time as it has taken up the temperature of the same. It is then 

 placed in the water of the calorimeter after the pointer of the sliding scale has been set to the tem- 

 perature of the water, and during heating the maximum position of the mercury on the thermometer 

 and on the sliding scale is read off. The sum of these two readings is the temperature which the 

 iron body has attained in the furnace. 



54.949. Water Pyrometer after Fischer, Figure, copper vessel with wood jacket, iron 

 case, protecting screen, stirrer, with three similar cylinders of pure nickel, without thermo- 

 meters (Fr. phys. Techn., 7 th Edn., I, 2, Fig. 3081) 



Cl. 6541, 1744, 

 6125, 612C. 



S. d. 



1.16.0 

 2. 2.0 



1. 2.0 



25. 0.0 



27. 0.0 

 31.10.0 



34. 5.0 



1. 5.0 



0. 3.0 



0. 4.0 



5. 0.0 



2. 0.0 



