20 A A N A L Y T I C A L C H E M I S T R Y

Α. Η. Τ. CO. SPECIFICATION

C A R I U S M I C R O F U R N A C E NEW MODEL, W I T H INCLINED CHAMBER

S713-F. Fig. 1. 5713-F. Fig. 2. Front View, showing control equipment mounted on front, and Rear View, showing inclined furnace chamber with built-in push

adapter tubes A rods B.

CARIUS MICRO FURNACE, Electric, Α. Η. Τ. Co. Specification. New model with inclined chamber. For organic reactions requiring the high pressures which result from heating reactants in sealed glass tubes as in the determination of halogens or sulfur by the Carius method. Designed to provide the optimum combination of oxidation and precipitation conditions and to minimize danger of injury to the operator in the event of accidental explosion during heating. Suitable for semi-micro procedures by using the furnace without the cylindrical adapter tubes A of Fig. 1.

Consisting of an aluminum block with four openings, 240 mm long X 14.3 mm diameter, and cartridge-type heating unit enclosed in insulated cylindrical Monel metal jacket, with explosion-proof cover, and mounted at an angle of 45° in a partly enclosed angle iron frame with frontal shield of reinforced aluminum.

The control equipment, including pyrometer, rheostat for adjusting furnace temperature between 140° and 400°C, pilot lamp and on-off switch are mounted on the front shield. Pyrometer range 0 to 400°C in 10° divisions, with estimation possible to 5°C; rheostat dial graduated 0 to 10 in 0.1 divisions.

The furnace cover consists of a cast aluminum head with flange 25 mm deep and four circular openings which admit the combustion tubes; cover can be rotated within con­trolled limits to close the furnace in use. I t is attached to the furnace chamber by means of a central post and spiral

spring to permit safe escape of the high pressure, in the event of accidental explosion, by allowing the cover to lift approximately 10 mm. Under such conditions, the flange directs emitted glass particles downward behind the frontal shield.

Built-in metal push rods, Β of Fig. 2, with fiber knobs are provided for each opening to facilitate removal of combus­tion tubes, but the weight of the complete outfit permits tipping, if necessary, for removal of debris from openings. Adapter tubes of Monel metal, with open ends, 235 mm long X 10.5 mm inside diameter, are supplied for use with Carius combustion tubes for micro determinations. They not only reduce the size of the openings but are an added protection in event of explosion.

All parts, excepting those of Monel metal, are finished with heat-resistant aluminum paint. Overall dimensions 13 inches wide X 10 5/s inches deep X 17 inches high. Net weight 29 lbs. Power consumption 350 watts.

5713-F. Micro Furnace, Electric, Carius, as above described, complete with pyrometer with iron-constantan thermocouple, four adapter tubes A, 3-ft. cord and plug, and directions for use. For use on 115 volts, d. c. or 25 to 60 cycles, a. c. Without glassware 150.00

5713-H. Ditto, but without adapter tubes; for semi-micro work 145.00

ARTHUR H. THOMAS COMPANY RETAIL— WHOLESALE — EXPORT

LABORATORY APPARATUS AND REAGENTS WEST WASHINGTON SQUARE, PHILADELPHIA 5, PA., U. S. A.

Cable Address "Balance," Philadelphia