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



501 



N 



No. 13762. No. 13766. No. 13770. No. 13772. No. 13774. No. 13778. No. 13780. No. 13784. 



No. 13786. 



No. 13806. 



13762. THERMO-REGULATOR, Gas, Dunham's, of glass, for regulation of gas flame. Without mer- 

 cury $2.00 



13766. THERMO-REGULATOR, Gas, Greenman Mercury, constructed entirely of steel, widely used in 

 connection with Greenman Burner No. 2102 for heating and regulation of incubators. A brass 

 jacket is supplied for the thermo-regulator which is to be filled with glycerine. Length of 

 thermo-regulator tube, 10 inches; diameter of outer jacket, 1 inch. With inlet and outlet tubes 

 threaded with % inch iron pipe thread for permanent connection with gas supply. Without 

 mercury .' 13.20 



13770. THERMO-REGULATOR, Gas, Mercury-Toluene type, of glass. Length, about 12 inches. 2.50 

 13772. THERMO-REGULATOR, Gas, same as No. 13770, but with a by-pass to keep flame burning. 



Without screw clamp 3.00 



13774. THERMO-REGULATOR, Gas, same as No. 13770, but with reservoir and glass stop-cock to vary 



the amount of mercury 7.50 



13778. THERMO-REGULATOR, Gas, Reichert's, of glass with brass adjusting screw. Length, 9% 



inches 4.80 



13780. THERMO-REGULATOR, Gas, Reichert's improved, with stop-cock to prevent extinguishing the 



flame 6.00 



13784. THERMO-REGULATORS, Gas, Roux Bimetallic, operating without the use of mercury or glass. 



Diameter of tube, 1 inch. 



Length, inches 10 12 



Each 9.90 10.65 



13786. GAS FILTER ATTACHMENT, for use with Nos. 13766 and 13784, for cleaning the illuminating 



gas of coal tar and other impurities. . . . : 5.40 



For GAS PRESSURE REGULATOR for use with Thermo-Regulators, see No. 7070. 

 THERMOS BOTTLES, see Vacuum Bottles. 

 THERMOSTATS, see Physical Chemistry Apparatus. 

 THISTLE TUBES, see Funnel Tubes. 



13792. THREAD, Cotton, White, No. 70, in spools of 150 yards Per spool .10 



Per dozen 1.00 



13794. THREAD, Linen, Black, No. 30, in spools of 200 yards. Per spool .40 



Per dozen 4.00 



13796. THREAD, Silk, Black, No. A, in spools of 50 yards Per spool .10 



Per dozen 1.00 



13800. THUMB TACKS, stamped steel, made of one piece, head $ 6 inch Per dozen .09 



13806. TIME MARKER, Electrically Operated, with aluminum stylus, for use in connection with No. 

 F783 Metronome (or other periodic circuit breaker) and a Kymograph (see No. F6065). 

 Mounted on a 10 mm rod 22 cm long, for clamping to any support. Small and compact; positive 

 in action . 6.75 



