No. 54 927. 



Air Thermometers. Pyrometers. 



585 



54 916. 1 : 3. 



54917. 1:4. 



54 918. 1 : 5. 



54 919. 1 : 4. 



54,915. - - idem, 150 cm long, for temperatures to 1100 C., in refractory fireclay tubes (to be 

 used in conjunction with one of the galvanometers Nos. 54,917/9); with Test Certi- 

 ficate of the Physikalisch-Technische Eeichsanstalt ; without galvanometer 



s. a. 

 16. 10. 



54,916. --idem, Figure, with small platinum tube of about 55 grammes weight in 

 the lower part, for temperatures to 1600 C. (for use in conjunction with one of Ilic 

 galvanometers Nos. 54,920/2). Extra price according to the prevalent price of platinum 

 (without Galvanometer) 17. 10. to 22. 10. 



54,917. Galvanometer for Thermocouples Nos. 54,912 and 54,915, with temperature scale 

 from to 1100 C., Figure, with pivot bearing, portable in case 



54.918. - - i d e m, with fibre suspension, Figure 



54.919. - - idem, with perpendicular scale, Figure, wall pattern instrument .... 



54.920. Galvanometer for Thermocouples Nos. 54,913, 54,914 and 54,916, with temperature 

 scale from to 1600 C., with pivot bearings, portable, in case 



54,921. - - idem, with fibre suspension 



."i-1, 922. -- idem, with vertical scale, wall pattern instrument 



54,923. Electric Resistance Thermometer, Figure, for temperatures between 200 and 

 + 900 C., within the ranges named under No. 54,928, 20 cm long, can be used for 

 distance reading, distance registration and registration in conjunction with one of the 

 indicating apparatus mentioned further on 



The resistance consists of a fine platinum wire fused into quartz glass in such manner as to protect 

 it entirely from external influences. The resistance wire takes up the external temperature very rapidly 

 (more quickly, for instance, than a mercury thermometer); the thermometer is insensitive to abrup, 

 temperature change owing to the excellent properties of the quartz glass. 



A complete installation consists of: (1) one of the thermometers Nos. 54,923/6; (2) an Indicator 

 for stationary use No. 54,928 or 54,929, fitted perhaps with signalling device No. 54,930; or a portable 

 Indicator No. 54,931 or 54,932; and (3) one or two Accumulators Nos. 54,936/7, according to the sen- 

 sitivity desired; or a Compensator No. 54,938. If recording is desired, use should, be made of (4) :, 

 Recording Galvanometer No. 54,933. If a number of thermometers are to be connected to the measuiiii". 

 arrangement, (5) a Plug Commutator No. 54,934 or 54,935 should be added. 



11. 5.0 



10. 10.0 



11. 5.0 



11. 5.0 

 10.10.0 

 11. 5.0 



2. 10. 



."11.1124. Extending the Thermometer every 10 cm costs in addition 



54,925. The same Thermometer with iron sheet, 50 cm long, with terminals on the por- 

 celain head 



0. 8.0 

 3. 0.0 



54.926. Extending this Pattern every 50 cm 0. 6. 



54.927. Test Certificate of the Physikalisch-Technische Eeichsanstalt for one Thermometer . j 0. 18. 



Cl. 1737, 



6540, 6547, 6518. 



