502 



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



No. 13862. 



No. 13864. 



13810. TIME SWITCH, for automatically disconnecting electrically operated instruments from the cir- 

 cuit at the expiration of a given interval of time. Consists of a single pole knife switch oper- 

 ated by a No. 3000 Interval Clock which may be set to throw the switch at the end of any in- 

 terval from }4 minute up to 2 hours. For use in circuits up to 15 amperes. Convenient for 

 use with electric centrifuges, incubators, sterilizers, shakers, etc. Complete as illustrated, 

 mounted on slate base with binding posts $10.00 



TIN BOXES, see Boxes. 



13818. TONGS, Crucible, Single Bent, brass, with riveted joint. Length, 9 inches 65 



13820. TONGS, Crucible, Single Bent, brass, nickel-plated, with riveted joint. Length, 9 inches. .95 



13824. TONGS, Crucible, Double Bent, brass, with riveted joint. Length, 9 inches 35 



13826. TONGS, Crucible, Double Bent, brass, nickel-plated, with riveted joint. Length, 9 inches .50 



13830. TONGS, Crucible, Double Bent, steel, with riveted joint. Length, 9 inches 20 



13832. TONGS, Crucible, Double Bent, steel, nickel-plated, with riveted joint. Length, 9 inches .30 

 13836. TONGS, Crucible, Double Bent, forged steel, nickel-plated, with lock joint. Length, 10 inches. 



With corrugated tips 3.00 



13840. TONGS, Crucible, Double Bent, solid nickel, with riveted joint. Length, 9 inches 1.00 



13842. TONGS, Crucible, Double Bent, solid nickel, with nickel-chromium tips, electrically welded on. 

 The tips take on an adherent coating which ' protects hot platinum with which they come in 

 contact. With riveted joint 3.25 



13846. TONGS, Crucible, Double Bent, steel, nickel-plated with solid platinum tips; lock joint. Length, 

 8 inches. Price varies with market price of platinum. 



13850. TONGS, Crucible, Double Bent, solid nickel, with solid platinum tips; lock joint. Length, 8 

 inches. Price varies with market price of platinum. 



13854. TONGS, Crucible, Double Bent, forged steel, nickel-plated with solid Palau tips; lock joint. 

 Length, 10 inches. Weight of Palau tips, about 4 grams 16.50 



13858. TONGS, Crucible, Double Bent, steel, nickel-plated, with riveted joint. For use in handling cru- 

 cibles and dishes in muffle furnaces. Length, 18 inches 3.00 



13862. TONGS, Crucible, Single Bent, malleable iron, for heavy crucibles. 



Length, inches . . 1" " 



Each 1-50 1.65 



13864. TONGS, Crucible, Double Bent, wrought iron, for heavy crucibles. Length, 30 inches. . . 1.80 



