NEW PRODUCTS
INTRODUCING A NEW CONCEPT IN
SEPARATORY FUNNELS EMPLOYING
The
Ultramax
T"eflon
VALVE...
a n d easy rotation of t h e stirrer and is reported virtually to eliminate t h e possibility of contamination a n d freezing. T h e gland is self-lubricating and offers protection against stirring rod breakage. I t consists of three p a r t s — a lower m e m b e r of Teflon machined t o fit 24/40 outer joints, a n O-ring, a n d a threaded inner member of aluminum. T h e stirring rod comes into c o n t a c t only with t h e O-ring. T h e knurled portion of the threaded inner p a r t can be adjusted by finger pressure t o press t h e O-ring evenly against t h e stirring rod. 16 Ultrasonic Generator
KONTES SEPARATORY FUNNELS Provide Practical Benefits to A l l Segments of the Chemical Industry egardless of t h e specialized chemical field in which R you are engaged, the U L T R A M A X T E F L O N VALVE, embodying in principle a sharp departure from conventional stopcocks, will provide you w i t h a host of exceptional values. N o lubricants, for instance, are required in these Separatory Funnels. This means t h a t you can now handle any material heretofore sensitive t o this substance. Acids, alkalies and other reagents will not cause them to stick. W i t h o u t lubricants t o dissolve, there is also freedom from troublesome leakage
A n inexpensive ultrasonic generator, Model 50, for use as a laboratory instrum e n t for experiments with small liquid samples or for cleaning small complex or delicate parts, including i n s t r u m e n t components a n d microchemical glassware, has been introduced b y M c K e n n a Laboratories. T h e a p p a r a t u s has a b a r i u m t i t a n a t e transducer t h a t resonates a t a frequency of a b o u t 1 megacycle to radiate high frequency mechanical vibrations into a quart-size container of cleaning solvent or a liquid sample in a test t u b e .
The smaller sizes of funnels (30 to 125 ml) are especially adaptable for centrifuging to speed up separations, and the valve is so designed t h a t it is completely locked in during this process. The K-452-5 series, cylindrical type, 30 ml., is ideal for vitamin analysis. It will fay you well to investigate KONTES' FUNNELS today.
SEPARATORY Used for ultrasonic experimentation, t h e device is suitable for studying chemical reactions or for emulsification, dispersion, and particle breakdown. 17
TYPES NOW AVAILABLE
Carbon-14 Compounds
K-4535 K-4525 K-4545 K-4525
T h r e e amino acids tagged with carbon-14 h a v e been announced by BioR a d Laboratories. Available in 1-millicurie s t a n d a r d packages are DL-norleucine-2-C 14 , DL-norvaline-1-C 14 , a n d DL-norvaline-2-C 14 . T h e latter two compounds, having specific labels in two differing positions, are expected t o be particularly useful for studies of amino acid metabolism. 18 Microscope Heating Stage
Write for Literature on Complete Series of Separatory Funnels. Ask also or Complete Catalog on Kontes' High Quality Standard and Specially-Designed Laboratory Glassware.
*Ultramax—Res- T . M . of Fischer & Porter C o . — * T e f l o n — R e s - T . M . o f E.I. DuPont C o .
KONTES VINELAND,
GLASS NEW
COMPANY
JERSEY
For further information, circle number 52 A on Readers' Service
52 A
Card, page 45 A
A heating stage designed for efficient a n d accurate microanalysis of waxes is available from William J. Hacker & Co., Inc. T h e stage is m o u n t e d upon t h e stage of a microscope with a n inclined observation t u b e . Optical equipment includes a special For further information, see coupon on page 45 A ANALYTICAL
CHEMISTRY
