BUFFER SOLUTIIONS FOR STANDARDIZATION OFOF PH; WATER REPELLANTS FOR USE ON CHEMICAL AND ELECTRO-CHEMICAL GLASSWARE; DESICCANTS FOR USE WITHIN SPECTROPHOTOMETER AND OTHER INSTRUMENT HOUSINGS; AND SALT BRIDGE SOLUTIONS FOR USE IN ELECTROCHEMICAL REFERENCE ELECTRODES.

BATTERY POWER REGUALTORS FOR MAINTAININGCONSTANT BATTERY CHARGE DURING SPECTROPHOTOMETRIC OPERATIONS; POWER SUPPLY ATTACHMENTS FOR ENERGIZING ULTRAVIOLET SOURCES USED WITH SPECTROPHOTOMETERS; MULTIPLEELECTRODE SWITCHES FOR CONNECTING A PLURALITY OF ELECTRODE ASSEMBLIES TO A SINGLE PH METER; ELECTR-CHEMICAL ELECTRODES-NAMELY, ELECTRODES OF THE GLASS METALLICTYPE AND REFERENCE ELECTRODES, FOR USE WITH PH MEASURING AND CONTROL EQUIPMENT; ELECTRODE ASSEMBLIES POSITIONING SUCH ELECTRODES FOR IMMERSION OR FLOWSAMPLE USE; AND VARIABLE ELECTRICAL RESISTORS AND POTENTIOMETERS OF THE SINGLE TURN AND MUTI-TURN TYPES.

RECORDING AND NON-RECORDING SPECTROPHOTOMETERS OPERATING IN THE VISIBLE, ULTRAVIOLET, OR INFRARED RANGES OF THE SPECTRUM; MONOCHROMATORS; ACCESSORIES FOR SPECTROPHOTOMETERS SOLD SEPARATELY THEREFROM-NAMELY, FLAME PHOTOMETRY ATTACHMENTS, FLUOUESCENCE AND NEPHELOMETRY ATTACHMENTS, DIFFUSE REFLECTANCE ATTACHMENTS FOR MEASURING THE DIFFUSE REFLECTANCE OF OPAQUE SAMPLES, RECORDING ATTACHMENTS FOR CONVERTING NONRECORDING SPECTROPHOTOMETERS TOTHE RECORDING TYPE, GAS AND LIQUID SAMPLE ABSORPTION CELLS, PHOTOMULTIPLIER ATTACHMENTS FOR INCREASING SENSITIVITY, TEMPERATURE-CONTROLLING BATH EQUIPMENT FOR THERMOSTATING SPECTROPHOTOMETRIC APPARATUS, GAS HANDLING ACCESSORIES FOR MEASURING AND PURIFYING GAS SAMPLES AND CONDUCTING SUCH SAMPLES TO THE SAMPLE CELLS OF INFRARED SPECTROPHOTOMETERS; PH METERS; AUTOMATIC TITRATORS FOR PERFORMING POTENTIOMETIC AND DEAD-STOP TITRATIONS; INSTRUMENTS FOR DETECTING AND MEASURING NUCLEAR AND OTHER IONIZEING RADIATIONS-NAMELY,PORTABLE SURVEY RATE-INDICATING AND INEGRATING-TYPE RADIATION METERS, CONTINUOUSMONITORING RATE-INDICATING RADIATION METERS AND POCKET PERSONNEL-TYPE ELECTRONICINTEGRATING RADIATION METERS; COLORIMETERS FOR ANALYZING SAMPLES BY MEASUREMENT OF A CHARACTERISTIC COLOR ABSORPTION ANDFOR MAKING SUCH MEASUREMENTS CONTINOUOUSLY ON FLOWING OR STATIC LIQUID OR GASEOUS SAMPLES; CHART RECORDERS FOR RECORDINGGALVANOMETER MIRROR AND OTHER TORSION-MIRROR DEFLECTIONS OHMMETERS; VACUUM TUBE ELECTROMETERS; MICRO-MICROAMMETERS; ELECTTROPHORESIS-CONVECTION APPARATUS FOR PROTEIN FRACTIONATION; ANALOG COMPUTERS; ELECTRONIC ANALOG-TO-DIGITAL CONVERTERS; CONTROL KNOBS FOR ANGULARLY ADJUSTING AND MEASURING THE POSITION OF A SHAFT; ANDCOMPONENT PARTS OF EACH OF THE FOREGOINGSOLD SEPARATELY THEREFROM.