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Instruments Leeds & Northrup Company General office and Works: 4941 Stenton Avenue, Philadelphia, Pa. Cricago St. Loots Los Angeles San Francisco Branch Offices: Cleveland Pittsburgh Houston Detroit Tulsa RUGGED, NULL-TYPE INSTRUMENTS THAT ARE RELIABLE Model S Micromax Recorder Records from I to 16 points on a single stripchart. Extremely open record. Can operate signals. (About 1/16 size) Model R Moeromax Recorder Records 1 or t points on a roundchart Has extremely readable dial. Can operate signals. (About l/16th size) Switchboard Indicator Hand-operated. Can 6e connected through selector switches to any number of points. (About 1/lSth size) Electrical Thermometers for Air Conditioning Electrical Instruments for the Heating Plant No method for measuring temperatures The facts needed to operate a modern fits the specific needs of air conditioning as heating plant so as to save fuel, to protect does the three-lead null-type resistance equipment, and to operate efficiently at thermometer method. It is independent varying loads are provided reliably by of distance and disregards all tempera rugged L & N instruments. Readings can tures except those right at detector loca be indicated or recorded or both. Re tions. The detectors (resistance thermo corders can be equipped to operate signals meter bulbs called Thermohms), can be or alarms that warn the operator of placed anywhere--in rooms, air ducts or extreme conditions. In some cases the water lines. They are connected by instruments control automatically. simple electrical wiring to instruments at a central location. Instruments may be: Micromax Recorders, Model S for up to sixteen Thermohms: Micromax Model R, for related pairs such as wet and dry bulb; indicators with switches for any number of Thermohms; or indicating and recording combinations. Micromax Model S. provides a per manent record of conditions at from 1 to 16 points on one wide-scale chart. Micro-, max Model R concentrates on conditions at one point, provides a permanent record, and has a giant indicating dial that can be read at a glance. The switchboard in dicator provides intermittent checks on This equipment is fundamentally re conditions at one or several points. liable. Instruments and Thermohms are In the heating plant, L & N measuring, highly responsive, yet rugged in construc tion. A complete system is easy and economical to install, regardless of dis signalling used for: 'N or controlling equipment is tances. It is easy to operate and demands minimum maintenance. Thermohms and instruments are interchangeable, and can be replaced without disturbing wiring or returning anything to the factory. Metermax Combustion Control. Furnace Pressure Control. Smoke Density Analysis. Flue Gas Analysis (Per cent COj). Flue pas Temperatures. L & N Resistance Thermometers make Steam and Water Temperatures. it possible to operate efficiently; to main Boiler Furnace Temperatures. tain comfort or correct process atmosphere pH--Alkalinity (or Acidity) of Water. constantly . . . . to get maximum return on Electrolytic Conductivity of Water. the entire conditioning investment. Percent Leakage of Cooling Water. T-362 934 I Instruments The Palmer Company 426 Clay Street Cincinnati (St. Bernard), Ohio Manufacturers and Originators--"Red-Readlng-Mercury" Thermometers PRODUCTS--Indicating Thermo meters with the RED column. "RED-READING-MERCURY" was originated by Palmer. We hold the basic patents on the reflected RED color. See illustration. A strip of red glass is drawn into the tube and when the mercury column rises, in the tube, the RED color is reflected onto it. Nothing is done to harm the purity of the mercury. Instruments for Testing AIR CONDITIONING EQUIPMENT When air-conditioning equip ment is installed, the contractor must have reliable and accurate instruments to make tests. Only with such instruments can he give satisfactory results. SLING PSYCHROMETER This, pocket style instrument can be carried anywhere and quick tests made.. Wet and drybulb tubes guaranteed accurate. Furnished with metal case, leather covered. INDUSTRIAL STYLE THERMOMETERS Furnished in all sizes and with STRAIGHT or various ANGLES styles. With Fixed taper thread, Union connection, Separable Socket or flange fit tings. With the RED column, these ther mometers are very easy to read. ACCURACY GUARANTEED ; MADE STRONG AND DURABLE. ASPIRATING PSYCHROMETER (This is not illustrated). The Aspirating Psychrometer for test ing humidity is recommended where readings of greatest pre cision are required. Contains small motor and blower so the air is blown over the wet and dry bulb thermometers. Two styles: Battery operated for use where there is no electric connection. Electrically oper ated, to plug in on No. 14200 light circuit. With carrying case; neat, compact, light weight. Very handy instru No. S27 ^ ment. OUTDOOR J\_. pnrirrT THERMOMETERS /1 THERMOMETERS ?- 'I * It is helpful to carry a 1 Here is an ideal thermometer IB'* pocket test thermometer, so I for use outdoors'or inside. The >'{! ` that it is available at any 0 metal case is of bronze which will n lilt .T time. not corrode. Graduated scale, Hr This is a reliable, guaran- giving very accurate tempera teed accurate thermometer. j ture. White Duco finish. Nickel- Easy to read with the RED 1 plate or Chromium finish also column. 1 furnished. With the RED TO 3'i Repairs--We can repair | column, it can be .seen, a great 0 1 all makes of mercury ther- * distance. 18 l'** mometers and furnish "Red- ( Other styles of Wall Ther Reading-Mercury" atnoextra ' mometers as well as Laboratory cost. The type of repair styles furnished with the RED S8$l work we do will add years to \ column. the life of the thermometer. i Write for FREE catalog No. No. 2120 A trial Order will convince fc, 200-C. Thermometer you. No. 13840 935