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

INFRARED, RESEARCH MODEL

CONSTANT TEMPERATURE BATH OPERATING SENSITIVITY ±0.005°C

9926-D.

CONSTANT TEMPERATURE BATH, INFRARED, Research Model, A.H.T. Co. Specification. Utilizes lagless, radiant heat from a reflector-type, infrared bulb with red bowl operating intermittently through relays and a mercury-in-glass thermoregulator, and provides operating sensitivity beyond that heretofore available with metallic heating units in this type of outfit. The bath offers full visibility and ample unobstructed working space for experimental work.

Temperature range, using only the infrared bulb, is to 45° C, and can be extended to 55° C at normal room tem­peratures by means of 100-watt auxiliary heater of im­mersion type. Operating sensitivity in this range is well within ±0.005° C; under carefully controlled condi­tions, in laboratory tests at about 37° C extending over several days, temperature control was maintained to ±0.001° C, as determined by a Beckmann thermometer.

The infrared bulb, 250 watt capacity, is mounted in a plastic* housing, 8 inches long χ 7ll% inches wide χ 8 inches high, which, in use, is placed on the table beside the bath, adjacent to the stirrer and thermoregulator. A metal baffle in the bath confines the focused rays from the lamp for optimum efficiency. Stirring is by means of a 1600 r.p.m. motor, power consumption 28 watts, and a four-bladed Monel paddle, 2 inches diameter, mounted on the non-metallic* top plate which fits on the rim of the bath without clamping. Maximum power consumption 385 watts.

The complete outfit includes a Pyrex brand glass jar, 12 χ 12 inches diameter; top plate with stirring motor

and baffle; thermoregulator, spring suspension for thermo­regulator; _ separate infrared heater in housing with relays and individual switches for power, stirring motor and auxiliary heater; 100-watt immersion heater; and ther­mometer, 0 to 50° C in 0.1 ° divisions.

The thermoregulator is a sensitive mercury-in-glass type, the setting of which is comparable to that of a Beck­mann thermometer. The thermometer included is for indicating the operating temperature; for precise work the use of a Beckmann thermometer in the working space is suggested but it is not supplied with the bath.

The temperature range can be extended by the use of immersion heaters of higher wattage in place of that regu^ larly supplied, or can be lowered below that of ambient air by addition of 9927-C Cooling Tube and external coolant^ such as tap water, but the operating sensitivity is reduced somewhat a t higher temperatures. The cooling tube fits into the top plate in place of the heater but is not regu­larly supplied with the bath.

ARTHUR H. THOMAS COMPANY RETAIL — WHOLESALE — EXPORT

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

Cable Address "Balance," Philadelphia

* Made of "Duralon," a product of the IT. S. Stoneware Co. 9926-D. Constant Temperature Bath, Infrared Research Mode!, as above described, complete with thermometer 0 to 00° C in 0.1°, 100-watt

immersion heater, 6 ft. cord and plug, and directions for use. For 115 volts, 60 cycles, a.c 165.00 9927-C. Cooling Tube, only, for use in 9926-D, complete with setscrew for attachment to top plate 7.50