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Instruments The Bristol Company Pioneers in Process Control Since 1889 Waterbury, Connecticut Akron. Ohio Birmingham. Ala. Boston, Mass. Branch Offices Chicago, III. Denver. Colo. Detroit, Mich. Los Angeles, Calif. New York. N. Y. Philadelphia, Pa. Pittsburgh, Pa. St. Louis, Mo. Seattle. Wash. San Francisco, Calif. The Bristol Co. of Canada, Ltd., 64 Princes3 Street, Toronto, Ont., Canada Bristol's Instrument Co., Ltd., North Circular Road, London, N. W. 10. England TRADE'MARK BRISTOL'S RSO. U. *. RAT. OmCS Recording Pressure Gages Recording Pressure Gage Model 40M For securing continuous day and night records of pressure or vacuum for steam, air, gas and liquids. Furnished with charts reading in pounds, ounces, feet, inches, metric or any other desired units for ranges from full vacuum to 12,000 lb per sq. in. Recording, Indicating Thermometers For all commercial ranges from 60 F below to 1000 F above zero. Electric Indicating Thermometer indicates temperature at any number of distant points. Metameter for Telemetering Consisting of (1) a recording receiver in your office or other central place, (2) a transmitter at the far point where the measurement is made, and (3) a simple circuit of two small gage wires (or any existing telephone line) for carrying the electric impulses automatically sent out by the transmitter, the Metameter tells accurately and instantly how pressure, temperature, or flow is fluctuating at any point a hundred feet or several thousand miles away. No interference with or from power, light or telephone lines. Easy to read 12 in. diameter chart, with wide open scale. D.C. or A.C.; 25 or 60 cycles; self-checking. Metameter Transmitter, Model M56T Automatic Tempera ture Control A complete line of Auto matic Control Instru ments is available for temperatures up to 3000 F. These are suitable for application to steam, oil, gas and electric heated equipment. Both electric and air operated models are furnished. Since Bristol makes both control instruments and automatic valves, it is able to develop the complete control system as a unit. Bristol has the experience and facilities correctly to engineer the system and to assume individual re sponsibility for the success of the results secured. ?Tet Van* Temperature Recorder Controller, Direct Reading Relative Humidity Recorder Chart record shows at a glance the trend of humidity condition. Novel vapor-sensitive hygroscopic element. Special aging process assures sustained ac curacy. Eliminates calculation, and use of Tkermo-Humidigraph, Model 4069 humidity tables. No water required. No fan used. Accurate below freezing tem perature. Light portable corrosion-resist ing case. Flow Meter for Steam, Liquids, Gas Employs orifice and mercury manometer system of measurement. Meter body is of forged steel, with stainless steel parts in side the mercury chambers. All connec tions are welded or mechanical. The stuffing box is of hardened stainless steel. Grease-packed and leak-tight. For working pressures up to 1000 lbs. Special bodies available up to 3000 lbs. Industrial Stem Thermometers With plain or red background. Fixed thread union connection or socket design. Straight form, or rear oblique, right side and left side angle forms. Wet- and Dry-Bulb Psychrometer Accurate and dependable instrument by which relative humidity or atmospheric moisture may be determined. Available in self-contained and distance types. 982 Instruments Brown Instrument Division of Minneapolis-Honeywelt Regulator Co. Main Office and Plant Philadelphia, Pa. Equipment available through more than sixty Minneapolis-Honeywell Branch Offices list of offices under Temperature Control Classification on Page 1114 of The Guide Brown Recording Resistance Thermometer Brown Instruments The extent to which air conditioning equipment is being used in office buildings, theatres, stores, industrial buildings, etc., has opened up a wide demand for indicating and recording resistance thermometers because the temperatures throughout these air conditioning systems should be checked periodically to get the best results at minimum operating cost. Indicating To obtain uniform conditions from modern equip ment, it is necessary that the one in charge have a visual picture of actual conditions. If the individual units of the system are controlled automatically, the operator will know when this control is adequate and when it is not. Whether automatic or manual, the Brown Resistance Thermometer will detect all variations, allowing the operator to maintain the conditions as set forth in the specifications. Brown Balanced Bridge Type Resist ance Thermometer and Multiple Key Switch Panel Recording Uniformity of temperature and the consequent control of humidity depends on reliable facts obtained concerning wet- and dry-bulb temperatures. Controlling Brown Portable Thermometer Because the three-lead Brown Resistance Ther mometer is entirely independent of variations in lead resistance, variation in bulb location lengths, number of bulbs, etc., it affords an excellent means of obtaining reliable results. Bulbs may be placed at will or changed from one location to another; instruments may be moved about, and readings or records taken without any delay due to recali bration of leads, instruments or bulbs. In addition to Resistance Thermometers, the Brown Instrument Division manufactures; Thermometers Hygrometers Pressure and Vacuum Gauges Potentiometer Pyrometers Flow Meters CO, Meters Tachometers Liquid Level Gauges Write for catalog on "Brown Instruments for Heating, Ventilating and Air Conditioning1' which includes a complete' set of sample specifications See also Pages 1114-1115 983