SCIENCE— ADVERTISEMENTS 



Pyrolectric Instrument Co. 



For your reference we are herewith furnishing a list of the precision instru- 

 ments and accessory items which we offer. Although primarily manufacturers 

 of electrical precision instruments of the highesit grade, w^e have added to our 

 line a few articles of other m^anufacture in an endeavor to serve our customers 

 vfith the best products available in each particular field. 



Your correspondence concerning the following articles is solicited. The 

 liberal Pyrolectric guarantee and our policy of absolute fair-dealing are dis- 

 tinctly to your advantage. 



AGREE HYDROGEN-ION APPARATUS 



AMMETERS (portable) 



ARTTON SHUNTS 



CALIBRATION OUTFITS FOR THERMO- 

 COUPLES 



CHEJnCALS FOR HYDROGEN-ION DE- 

 TERMINATIONS 



COLLS, RESISTANCE 



COMPTON QUADRANT ELECTRO- 

 METERS 



DEFLECTION POTENTIOMETERS (Py- 

 roTolter type) 



ELECTRO-DYNAMOMETERS 



ELECTROMETERS 



ELECTROMETER SUSPENSIONS 



GALVANOMETERS, A. C. 



GALVANOMETERS, D. C. 



GALVANOMETER SPOT LIGHTS 



GLASSWARE FOR HYDROGEN-ION 

 DETERMINATIONS 



HYPSOMETERS 



HYDROGEN-ION APPARATUS AND 

 CHEMICALS 



INDUCTANCE, FIXED STANDARDS OF 



INDUCTANCE, VARIABLE STANDARDS 

 OF SELF AND MUTUAL 



KEYS, TAPPING AND MISCELLANEOUS 



LAMPS AND SCALES 



MEGOHM RESISTANCE BOXES 



MICROVOLTERS, NORTHRUP 



MILLIVOLTERS, NORTHRUP 



MILLIAJnWETEBS (portable) 



MILLIVOLTMETERS (portable) 



NORTHRUP PYROVOLTERS 



NORTHRUP FLAT-COIL RESISTANCES 



PER CENT. BRIDGES 



POHL COMMUTATORS 



POTENTIAL SETS 



POTENTIOMETERS, NORTHRUP pH 

 PYROVOLTER TYPE 



PROTECTION TUBES FOR THERMO- 

 COUPLES 



PYROMETERS (indicating) 



PYROVOLTERS, NORTHRUP 



PYROVOLTER ADAPTERS, NORTHRUP 



QUARTZ FIBRES 



REICHSANSTALT RESISTANCES 



RESISTANCE BOXES, DIAL DECADE 



RESISTANCE COILS 



RESISTANCES, NORTHRUP FLAT-COIL 



RESISTANCE STANDARDS, REICHS- 

 ANSTALT 



RESISTANCE STANDARDS, OIL- 

 SEALED 



RESISTANCE THERMOMETERS 



RESISTANCE UNITS, « HANDY " 



SHUNTS, STANDARD 



SWITCHES, MISCELLANEOUS SMALL 



SWITCHES, SELECTOR 



SWITCHES, MERCURY CUP SELECTOR 



THERMOCOUPLES 



THERMOCOUPLE CALIBRATION OUT- 

 FITS 



THERMOMETERS FOR COLD JUNC- 

 TION CORRECTIONS 



THERMOS COLD JUNCTION BOTTLES 



VOLT-AMMETER SETS 



VOLT BOXES 



VOLTMETERS 



WHEATSTONE BRIDGES 



If you hare never receiyed a binder for our literature, ask for it. There is one for 

 you. The Pyrolectric Bi-Monthly Bulletin is an interesting and unique publication. 

 There is no charge for it. 



PYROLECTRIC INSTRUMENT CO. 



ELECTRICAL PRECISION INSTRUMENTS 

 636-640 East State Street TRENTON, N. J. 



