. Bacteriological apparatus : pathological, biochemical. Scientific apparatus and instruments; Bacteriology; Chemical industry. SMSf ®I|p UtU (Unrpnratimt, &nirf?*>strr, N- Regulator, Thermo—Mast Electric. Designed by Dr. S. 0. Mast, associate professor of zoology at Johns Hopkins University, to meet demand for accurate and sensitive electric thermo-regulator; simple in construction and easily operated; can be used in connection with any form of electric lamp or stove as heating unit; 16 c. p. carbon lamp, providing sufficient heat for fairly large paraffin bath, can be operated wit
. Bacteriological apparatus : pathological, biochemical. Scientific apparatus and instruments; Bacteriology; Chemical industry. SMSf ®I|p UtU (Unrpnratimt, &nirf?*>strr, N- Regulator, Thermo—Mast Electric. Designed by Dr. S. 0. Mast, associate professor of zoology at Johns Hopkins University, to meet demand for accurate and sensitive electric thermo-regulator; simple in construction and easily operated; can be used in connection with any form of electric lamp or stove as heating unit; 16 c. p. carbon lamp, providing sufficient heat for fairly large paraffin bath, can be operated without relay; if more heat is desired, more than one regulator or a relay must be used; apparatus consists of a tube, one end of which is extended upwards to carry operating mechanism; furnished in two forms—one, with single straight tube of small bore widening into a wall at the bottom, the other with a double U-tube; in first form tube is filled with mercury, in latter with glycerine, alcohol or toluol, and at top with mercury; while second form is more delicate, it affords a very sensitive control, which, under favor- able conditions, does not vary more than 1/10°; a cork, connected by a fine rod with a movable cross piece, which closed the relay or switch, floats in mercury, which, when temperature rises, expands, causing the cork to rise and close the circuit; when heat drops again, mercury contracts, forcing the cork to sink and open the circuit; adjustment is provided for regulating the space through which the cork must move before operating the switch. 16695 No. A. Simple Type Each 16696 No. B. Double U-Tube Type Each Regulator, Roux Bimetallic. An accurate regulator made without the use of mercury or glass; most accurate of the gas regulators, yet simple in operation; can be adjusted to regulate an even tempera- ture more constantly than others; large size Each 16698 Regulator, Roux Bimetallic. Small size Each 16700 Regulator, Roux Bimetalli
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificapparatusa
