mtzi-OKmSL
NEW PRODUCTS
each. The cells can be returned to Labline for recharging. The cabinet, of metal construction, has a built-in water valve, stainless steel sink and top, and plastic discharge goose neck. It stands 37 inches high and meas ures 20 X 20 inches in width and depth. 10 Flash Point Tester
TRY THE
Fisher Scientific Co. has redesigned its Tag open-cup flash point tester with a built-in 150-watt electric heating unit in the base. A variable transformer permits the heating rate to be controlled in conformance with ASTM specifica tions. The apparatus is available also with gas and with alcohol lam]) heaters. Each type has a water bath to hold the sample cup, a swivel thermometer sup port, and a flame-tipped «'and with which to ignite the vapors from the sample. The water bath is designed with an outlet and inlet so that water can be circulated between determina tions to cool the sample cup. 11
WAY MACHLETT
A completely self-contained unit, the VirTis freeze-drying apparatus does not require the conventional dry ice chamber, condenser, etc. The inner 2.8 liter cooling chamber holds enough dry ice and solvent for unattended over-night operation. And, furthermore, because of its large capacity, it lends itself readily to shell freezing (see illustration). Freeze-drying unit and trap are expertly made of polished 18-8 stainless steel and hence can be autoclaved after use with infectious materials. The apparatus is fitted with 12 take-off taps capable of removing a minimum of 100 ml of water. For added simplicity, freeze-drying flasks are designed with a wide mouth to facilitate easy removal of dried materials.
E36-693 Stainless Steel Drying Unit, without Stainless Steel Trap and Glass Flasks E36-693-3 Portable Freeze-Drying A p paratus as above mounted on Sturdy Stainless Steel Cart with casters. Stainless Steel Trap, McLeod Gauge (without mercury), and Heavy Duty 1/3 H.P. 115 Volt A.C. "Duo Seal" Pump E36-693-1 Stainless Steel Micro Drying Unit similar to R36-693 but with 8 taps and 800 ml cooling chamber E36-693-2 Stainless Steel Super Drying Unit, 10 liter capacity with 20 taps (similar to R36-693) E36-693A Stainless Steel Trap SPECIALLY DESIGNED FREEZE-DRYING E36-693B Flask, 25 ml E36-693C Flask, 50 ml E36-693D Flask, 100 ml E36-693E Flask, 250 ml E36-693F Flask, 500 ml E36-693G Adapters lor Flasks E36-693V Bleed valve for breaking vacuum on individual flasks without disturbing rest of unit. Can also serve as adapter
$1 30.00
625.00 65.00 250.00 35.00 FLASKS S 8.00 8.60 8.80 12.50 14.00 2.50 J4.50
IMPROVED Machlett All-Glass Freeze-Drying Apparatus
Electromagnet
A laboratory electromagnet for pro ducing varying magnetic field configura tions is being produced by Varian As sociates. The magnet, model V-4004, has two fixed energizing coils with ad justable poles and readily changeable pole caps. By adjustment of each pole, any air gap width up to 4.3 inches can be ob tained. A variety of cylindrical, conical, or specially-shaped pole caps are avail able for a wide range of flux patterns. A gap field flux density as high as 28,600 gauss can be attained. 12 Ultracentrifuge Temperature Control
A system for continuous measurement and control of the temperature of operat ing ultracentrifuge rotors to better than 0.1° C. has been designed by Specialized Instruments Corp. The apparatus, which is applicable to any of Specialized Instruments' Model Ε analytical ultracentrifuges, consists of a thermistor em bedded in the rotor, electrical connec Ε36-695H Machlett A l l Glass Freexe-Drying Unit complete as illustrated with adapters, sup tions brought out through mercury pool port stand and rings and four flasks 100, 200 or 250 ml capacity (Please specify) $66.00 contacts, and a control unit and indica Ε36-695J Machlett Freeie-Drying Unit o n l y . . . 44.00 tor panel which mounts on the front E36-695B Freeze-Drying Flasks, 100, 200 or • 250 ml 3.00 j panel of the ultracentrifuge. Ε36-695F Support Stand and Rings 10.00 ! In response to the control unit, a All Prices F. 0 . B. New York, Ν. Υ. ' small electric heater beneath the rotor For further information write for Bulletin F-D ; supplies radiant energy as required. The equipment is said to eliminate the need to use a thermocouple and reference E. MACHLETT & SON bath system. Provision can be made to 220 E A S T 23rd S T R E E T · N E W Y O R K . 1Ο, Ν.Υ. APPARATUS · SUPPLIES · CHEMICALS For further information, see coupon on page 43 A further information, circle number 50 A on Readers' Service Card, page 43 A (This Unit is a modification Model of the Lyophil Apparatus developed by Drs. D. H. Campbell and D. Pressman.) This economical self-contained unît is ideally suited for freeze-drying operations up to 400 ml. Standing only 21"' high» apparatus has a built-in dry ice and solvent chamber and four conveniently located ground, standard taper drying ports around its lower periphery. Standard size for joints is 3 4 / 4 5 , but special sizes can be ground to your specifications.
For
50 A
ANALYTICAL
CHEMISTRY
