Product Copsules (Continued from page 62 A) visible, and infrared regions. Unit is cited as being small, compact and con venient to use. Farrand Optical Co., Inc., Bronx Blvd. E. 238th St., Ν. Υ. 70, Ν. Υ. 20Α
Made from the new high density POLYETHYLENE, much publicized for its high temperature resistance, higher tensile strength, greater rigidity, and superior chemical resistance. It has been tested at continuous temperatures of 250 °F. compared with 170°F. for standard polyethylene which means that, now, polyethylene tubes can | H H | TUBES, CENTRIFUGE or TEST Capacity ml Dimensions mm Price ea. be sterilized in a standard autoclave! 3.5 75x12 6.5 100 χ 13 12 100 χ 16 13 115x16 18 115x19 50 105 χ 29 100 162 χ 32 Conical Type 15 ml capacity Less quantity discounts
.27 .28 .31 .35 .42 .45 .65 .30
At Laboratory Supply Dealers Everywhere The
N A L G E
R O C H E S T E R 2 . N E W YORK For further information, circle number 64 A-1 en Readers' Service Card, page 71 A
Β U R R ELL
"For Scientists Everywhere"
KROMO-TOG© For G a s a n d V a p o r - P h a s è CHROMATOGRAPHY • Routine Analysis in Any Laboratory'. • Process Control in Manufacturing !
C O M P A C T
S I Z E
Only 2 4 " χ 1 6 " χ 1 3 " BUILD-UP
Accessories can be added to basic unit NEW
Bench or panel-mount anywhere . . . uses metal columns of various lengths . . . analyzes gases or liqiiids* even liquids boiling up to 300°C Fractions collected easily, individual temperature control of cell and columns, finest detector cell available and other exclusive Burrell features. You'll get unexpected accuracy and thoroughness far faster than ever before.
Cat. No. 340-30 — $695. for Basic Unit · Ask for Bulletin 831 F. Ο . Β. PITTSBURGH, P A .
B U R R E L L ,
C O R P O R A T I O N
Scientific Apparatus and Laboratory Supplies
2223 Fifth Avenue, Pittsburgh 19, Pennsylvania For further information, circle number G4 A-2 on Readers' Service Card, page 71 A
Nefluoro-Phofometers. Illustrated how-to booklet available on company's three-purpose Nefluoro-Photometer that combines in one instrument a color imeter, nephelometer and fluorometer for rapid and precise determination of a wide variety of organic, inorganic, synthetic and biological materials. Fisher Scientific Co., 100 Fisher Bldg., Pittsburgh 19, Pa. 60A Partition Chromatography Appa ratus. 8-page booklet available that shows the value of company's "Partitioner" for analytical control of petroleum products, gas and liquid fuels, plant effluent gases, commercial solvents and many other industrial and research uses. Fisher Scientific Co., 101 Fisher Bldg., Pittsburgh 19, Pa. 2nd Cover pH Meters. Data sheet available on unit with the following cited advantages : warm-up, less than 60 seconds; response about 1.5 seconds; completely un affected by zero drift, electrical pickup, a-c surges; limit of error, ± 0 . 1 p H ; reproducibility, ±0.02 pH. Leeds & Northrup Co.. 4906 Stenton Ave., Phila. 44, Pa. 36A pH Meters. Bulletin available on com pany's complete line of battery-oper ated and line-operated pH meters in corporating modern electronic tubes and circuits. Simple in operation and maintenance, featuring sealed ampli fier plug-in units. Photovolt Corp., 95 Madison Ave., Ν. Υ. 16, Ν. Υ. 39 A-1 Photofluorometers. Bulletin provid ing complete details available on unit used for rapid, precise analysis by fluorescence. Model is entirely a-c line-operated. The high intensity mer cury vapor lamp source and the photo tube amplifier are automatically stabi lized against line voltage variations. Coleman Instruments, Inc., Mavwood, 111. " 23A Phototubes, Multiplier. Company's 3 / 4 " multiplier phototube is cited as having the ruggedness of field equip ment combined with the performance of a laboratory tube. Average gain is 300,000 at 105 v/stage. Linear boxtype dynode structure is used. InIndustrial Tube Sales Dept., Allen B. DuMont Laboratories, Inc., 2 Main Ave., Clifton, N. J. 11A ANALYTICAL