CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



421 



No. 11140. 



Nos. 11130-2. 



39 



7.15 



They 



B 



1*4 



.83 



11112. PROTECTING TUBES, Porcelain, for Platinum Thermo-Couples, with a melting point of 3600T. 

 They should not be subjected to sudden changes of temperature. 



Length, inches 12 18 27 39 



Each . $4.40 5.50 7.45 11.00 



11118. PROTECTING TUBES. Quartz, for use where sudden fluctuations in temperature are met with, 

 or where a tube with very small lag is desired. Melting point, about 2400T. 



Length, inches '. 12 18 27 



Each 3.85 4.40 5.25 



11120. PROTECTING TUBES, Steel, for Base Metal Thermo-Couples, to protect from gases, etc. 

 should not be used at temperatures above 1400F., nor in an oxidizing atmosphere. 



No A 



Diameter outside, inches % 



Per foot . ...... - 55 



11122. PROTECTING TUBES, Calorized Steel, subjected to calorizing which increases the life of the 

 steel when used at high temperatures. 



Length, inches 12 18 24 36 



Each 2.75 3.30 3.85 4.95 



11130. PYROMETERS, Hoskins Low Resistance, Portable Type, complete with 36-inch thermo-couple 

 of Alumel and Chromel wires, twisted and welded together. The special feature of this out- 

 fit is the fact that the operator can easily make his own thermo-couples, when replacement is 

 necessary. The Alumel and Chromel wires can be obtained in coils of various gages, so cali- 

 brated that all couples made from two given coils are interchangeable. The ends of the wires 

 should be twisted together and welded, and are then ready for use. Complete with low- 

 resistance portable indicator in black enameled aluminum ease 6*4x6x3 inches, weighing 5 

 pounds; 36-inch standard thermo-couple; and 20 feet of flexible leads. 



Xo A B 



Range. 32 to, degrees F 1000 1500 



Graduated to, degrees F 10 20 



Each 47.00 47.00 



11132. PYROMETERS, Hoskins Low Resistance, Portable Type, same as No. 11130, but with scale 

 graduated in Centigrade degrees. 



No A 



Bange, to, degrees C 550 



Graduated to, degrees C 5 



Each 47.00 



11140. PYROMETER, Scimatco Optical, Patented, for measurements of temperatures from 1200 to 

 7200F. With this instrument, direct observation is made of the object whose temperature 

 is to be measured. The instrument can be readily standardized by the operator in a few 

 minutes time. There are no errors due to connecting wires, cold junctions, temperature 

 changes, or sensitive electrical instruments. The life of the instrument with ordinary care is 

 indefinite, and the only cost of upkeep is that of recharging the storage battery. Espe- 

 cially suited for use in foundries, blast furnaces, steel works, glass factories, smelters, gas 

 works, brick and tile factories, porcelain factories and in research work on high tempera- 

 tures. Complete with tripod, storage battery, current regulator, 3 extra lamps and bottle of 

 amyl acetate, in two carrying cases. Bange," 800 to 2000C 175.00 



B 



800 

 10 



47.00 



C 



2000 

 20 



47.00 



C 

 1100 



10 

 47.00 



D 



2500 

 25 



47.00 



D 

 1400 



20 

 47.00 



