420 



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



No. 11100. 



No. 11102. 



11093. PROTECTING CASES, similar to No. 11092, but intended to contain both Pyrometer and 

 switchboard. The switch handle extends through the glass door, and is provided with a stuf- 

 fing box to make the opening dustproof. As the contacts wear, the spring tension can be tight- 

 ened up without opening the case. Price includes mounting of instruments and switchboard 

 in case before shipment, but not price of instrument or switchboard. 



No A B 



For Pyrometer, type high resistance low resistance 



Each $8.25 8.25 



Note: Nos. 11092 and 11093 should be ordered when the Pyrometer is ordered, as it must be 



mounted at the factory. 



11096. SWITCHBOARDS, for use with Brown Pyrometers where several thermo-couples are to be con- 

 nected to the same Indicating or Recording Pyrometer. This is a rotary switch with posi- 

 tive spring contacts, the tension of which may be taken up as the contacts wear. 



Number of points 2 4 6 8 12 16 



Each 6.60 7.70 8.80 9.90 12.10 14.30 



11100. THERMO-COUPLES, Base Metal, for use with Nos. 11058 to 11088, for measuring temperatures 

 up to 1800F., and for intermittent use up to 2000F. The couple consists of two %-inch 

 rods of nickel alloy welded together at one end and insulated throughout their lengths by 

 asbestos for temperatures up to 1000F., and by lava above that temperature. Complete with 

 head and binding posts for attaching lead wires, and with protecting tube of steel pipe unless 



otherwise specified. With adjustable flange. Length, 24 inches 8.80 



Note^ For lengths above 24 inches per foot, add 1.10 



11102. THERMO-COUPLES. Platinum, for use with Nos. 11058 to 11088, for temperatures up to 

 3000F., or 1600C. The couple consists of one wire of chemically pure platinum and one of 

 an alloy of platinum with 10 per cent, rhodium, of a diameter of 0.02 inch. The wires are 

 insulated by small fire-clay tubes pierced with two holes. Complete with iron head and 

 porcelain block with binding posts, and with protecting sheath of porcelain. (If specified in 

 ordering, a quartz sheath may be furnished instead of porcelain.) 



Length, inches 12 18 24 36 



Each 38.50 50.60 60.50 79.20 



11106. PROTECTING TUBES, Graphite, for Thermo-Couples, for protection from molten metals. 



Length, inches 12 18 24 36 



Each 3.30 4.40 6.60 8.80 



11108. PROTECTING TUBES, Nickel-Chromium, for base metal thermo-couples for use at tempera- 

 tures between 1500 and 2000F. They may also be used in lead hardening baths, and as an 

 additional protection over porcelain or quartz tubes. 



Length, inches 12 18 24 



Each 5.50 8.80 12.10 



