MANUFACTURERS'
LITERATURE
regulator coupled with an electronic relay to provide rapid response to temperature change; temperature con trol is said to be accurate to 0.05° Γ. Other features include a wide tempera ture range and a built-in cooling coil for operation below room temperature. The Temp Trol does not require a con tinuous water supply, since the 2'/ 2 -gal. capacity is ample for continuous circula tion. 16
A Great Forward Stride in Laboratory Evaporation
Corrosion Test Humidity Cabinet
A new humidity cabinet for testing effectiveness of corrosion preventive materials has been announced by Labline, Inc. The cabinet operates at 120° F . and is approximately 28 X 28 X 28 inches deep. It contains immersion heaters, an air manifold with diffusers, and a revolving rack which holds 33 test panels. A dual thermostat provides safety of operation.
ROTOVAP Automatic Distilling Apparatus
17 MANUFACTURERS' LITERATURE
Furnaces. Catalog of 20 pages de scribes various sizes and types of electric furnaces, temperature controllers, and hot plates available from Thermo Electric Mfg. Co. (Cat. 55). 18 Spectroscopic Supplies. Catalog gives complete listing of spectroscopic sup plies, including descriptions and prices. Jarrell-Ash Co. (Cat. S7-5S). 19 Industrial pH Guide. Four-page illustrated bulletin simplifies selection of components such as meter, flow, or immersion assemblies, electrodes, and manual or automatic electrode switches. Beckman Instruments, Inc. (Bull. 425). 20 Liquid
Scintillation
Spectrometer.
Six-page bulletin gives operation and application of liquid scintillation spec trometer for precise counting of beta samples in solution with liquid phos phors. Packard Instrument Co. (Bull. 814—3-55). 21 Direct-Reading
C O M P L E T E L Y A U T O M A T I C , ROTOVAP is engineered for t h e safe, rapid and efficient evaporation of solutions— either dilute or concentrated by batch or continuous operation. Because Rotovap incorporates a unique ball bearing assembly which rapidly rotates t h e evaporating flask, frothing and "bumping" of even concentrated solutions is eliminated. The speed a t which Rotovap distills is uncanny. For ex ample, it will evaporate automatically 100 ml of aqueous solu tion a t 55° C in 10 t o 15 minutes under the reduced pressure of an ordinary water aspirator. For low boiling solvents—such as butanol—Rotovap's speed is correspondingly high. For detailed information, write for folder RV. E32-922 Rotovap complete as illustrated but without dropping funnel. 110 Volts A.C E32-922A Glass evaporating Flask, 250 ml $1 .80 E32-922B Glass connecting spindle.4. 75 E32-922C Glass connecting elbow with continuous feed tube 6.50
TEFLON BALL A N D SOCKET ASSEMBLY W h e r e all glass system is not required w e recommend using Rotovap's n e w sturdy Teflon ball and socket spindle assembly. This self lubricating unit works freely w i t h extremely high vacuums.
Spectrometers.
Eight-page bulletin gives description of improved direct-reading spectrom eters featuring automatically operated monitor. Baird Assoc, Inc. (Bull. 44)22 Laboratory Glassware. Two-page bulletin in newspaper format is first in series describing development in scientific laboratory glassware field. Doerr Glass Co. (Doerr Glas? ATcws). 23
$185.00
E32-922D Glass condensing flask with drainage tube and stopcock 8.25 E32-922E Plastic Belt 75 E32-922F Perforated Metal cooling spray 2.25
E32-922TB Teflon connecting spindle E32-922TC Teflon connecting e l b o w
$ 9.75 11 . 5 0
See ROTOVAP and other Machlett laboratory expedi ters at Booth C-33, 25th Exposition of Chemical In dustries, Philadelphia, December 5-9
