36 A ANALYTICAL CHEMISTRY

Leco Fast Delivery! Leco GLASS BLOWING SERV­ICE gives you the fast­est d e l i v e r y in t h e nation!

C u s t o m p a r t s mode to your specification or according to description in any technical publication.

Leco CUSTOM and REPAIR GLASS BLOWING

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Hotpack TRADE MARK

S E N D FOR C A T A L O G WALK-IN

CONSTANT TEMPERATURE

ROOMS

Now a choice oF CONTROL TEMPERATURE

IN TWO RANGES 5°C. to 40°C. 3 5 ° C t o 6 0 ° C .

Prefabricated from Aluminum —Easily Assembled and Disassembled in the Laboratory — Additional Sections can be Added.

• Portable - Flexible - Precise

• Room is completely prefabricated and can be assembled on location in 2 or 3 hours by bolting sections together.

• Double Walls of Aluminum with 3 inches of insulation.

• Scientifically designed heaters and blower air circulation insures com­

plete uniformity throughout the room.

• More than 90 square feet oF standard shelf space.

• Three sizes available with interiors 4 ' wide χ 4 ' deep χ 7' high 4 ' wide χ 6 ' deep χ 7' high A' wide χ 8 ' deep χ 7' high

Write for Bulletin CTR

THE ELECTRIC Hotpack COMPANY, Inc. 5 0 4 7 COTTMAN STREET, PHILADELPHIA 3 5 . PA.

LABORATORY EQUIPMENT CORP. S T . J O S E P H 2 , M I C H I G A N

L-702, Size 2 L-701, Size 1

Une o4riâtocrat C E N T R I F U G E

AN OUTSTANDING ADVANCEMENT IN CENTRIFUGE DESIGN O n e o f t h e m o s t c o m p a c t c e n t r i f u g e s e v e r d e s i g n e d — b o w l , m o t o r a n d al l w o r k i n g p a r t s a r e E N C L O S E D in a h a n d s o m e floor m o d e l s t e e l c a b i n e t . All contro l s a n d i n d i c a t o r s m o u n t e d o n a s i n g l e r e c e s s e d p a n e l in front . Its m o d e r a t e p r i c e , a d v a n c e d d e s i g n a n d l o n g l i fe m a k e it t h e o u t s t a n d i n g v a l u e o f t h e m a l l .

Aristocrat Centr i fuges c a n b e d e s i g n e d a n d e n g i n e e r e d to m e e t SPECIAL r e q u i r e m e n t s if y o u d e s i r e . Write u s a b o u t it.

PHILIPS-DRUCKER ST. LOUIS 10 , M I S S O U R I