READERS' INFORMATION SERVICE Viscometers Voltage Stabilizer· Water Bath·
Reiractometers OBC-1 Refractometers, Butyro OBC-3 Reiractometers, Dipping OBC-5 Reiractometers, Hani OBC-7 Refractometera, Induatrial OBC-4 Reiractometers, Juice OBC-6 Rafractometers, Oil Grading . . . . OBC-8 Refractometera, Precision OBC-2 Shakers 99 A-2 Spectrofluorometers 96 A-2 Spectrographs 92 A-2, 107 A Spectrometers . . . . 8 A, 41 A, 57 A, 111 A Spectrophotometers . . . . 51 A, 81 A, 114 A Spectrophotometers, Double Beam . 68 A-l Spectrophotometers, Infrared . . 3 A, 68 A-2 Spray Bottles 98 A Stainleaa Steel Beakers 21 A-10 Stirrers 90 A-3 Stopcocks 54 A Sulfur Titrators 48 A-2 Syringes 88 A-2 Teflon Pumps 66 A Tenaiometers 32 A-l Thermostats 31 A-l Titrators 73 A Tubing, Plastic 84 A Ultrasonic Cleaner 27 A
Su A 45 A 21 A-l
John SPRAY BOTTLE
CHEMICALS AND MATERIALS Adsorbents Chelate Atom Models Cleaners, Glassware Filter Papers Ion Exchange Resins Polyethylene Radiochemicals Reagents
104 A 21 A-7 108 A-2 19 A, 25 A-l 36 A IFC 96 A-l 85 A, 101 A
for
CHROMATOGRAPHY
MISCELLANEOUS Marking Pencils Spectrogram Catalog
105 A-2 58 A
PIACE
• Uniformly fine «pray
STAMP HERE
• Instantaneous control •
READERS' INFORMATION SERVICE Analytical Chemistry 430 Park Avenue New York 22, Ν. Υ.
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24 37 50
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For wide variety of liquids
An ingenious spray tube provides uni formly fine mist or spray, as required for paper chromatography, from a wide variety of liquids with high or low viscosities, different vapor pres sures, etc. Sprays large areas conveni ently from a distance of approximately three feet when connected with a source of air pressure of three lbs. per square inch, but a pressure of five lbs. per square inch is rec ommended. Instantaneous control of spray is provided by applying thumb to a Ji-inch vent in rear of the spray tube. Spray tube is of Pyrex brand glass, with permanently attached plastic screw cap size No. 24 which fits commercial narrow mouth, screw neck bottles. Overall height 7 ^ inches; takes rubber tubing J^-inch bore. 9186-R2. Spray Bottle, Chromatographic (Atom izer), John (Patent pending), as a b o v e d e scribed, with spray tube, screw cap and 8 oz. glass b o h i e , but without air pump or rubber tubing 8.00
ARTHUR H. THOMAS CO. 29 42
Laboratory Apparatus and Reagents VINE ST. AT THIRD
PHILADELPHIA 5, PA. More and more laboratories RELY O N THOMAS
Address Circle No. 98 A on Readers' Service Card, page 97 A
