D' you know what your BOD's been up to this week?" "Of course." "Oh yeah? So where was it on Wednesday?" Many people measure Biological Oxygen Demand just twice a week —once Monday, once Friday. Then they rule a perfectly straight line between their two data points, and call it a week. It's an understandable practice because the standard BOD test eats time. Our automated electrolytic BOD analyzer makes the test a breeze. It reads out continuously, so come Friday you've got an honest, lumpy curve that accurately depicts deviations like initial and intermediate lag phases. One E/BOD can save you as much as $1350 per year in man-time. Better yet, it will let you know exactly what your BOD was up to on Wednesday and every day. Write for details
OCEANOGRAPHY INTERNATIONAL Post Office Box 2980 College Station, Texas 77840
(713)846-7721
CIRCLE 1 5 9 O N READER SERVICE CARD
The Bath of Tomorrow. Today
Something for Everyone (in gas chromatography)
i '
Mr
-*•*?•&
%
a.
*
J
The Forma model 2800 refrigerated and heated bath and circulator. Solid-state electronics with a low profile design sets new standards for performance, convenience and appearance. The temperature range of —20° C to + 70 e C, ±0.02° C assures maximum control of the 7.5 gallon bath medium The refrigeration system is quiet; no solenoid valves, no RFI energy transmission. Heavy duty stainless steel pump with external flow valve promotes use as an external circulator. Digital thermometer optional. FROM FORMA.
THE BATH PEOPLE.
Send for your FREE copy of 48-page Catalog 700.
Distributed and Serviced Nationwide.
Forma Scientific
BOX 649 · MARIETTA. OHIO 45750 · AREA CODE 614/373-4763 TELEX 24-5394 · TOLL FREE 1N-WATS SERVICE 800-848-9730 AREAS
We're a source for h u n d r e d s of useful, u n i q u e and u n u s u a l c h e m i c a l s , s u p p l i e s and g a d g e t s w i t h special appeal to the gas c h r o m a t o g r a p h e r . Our catalog lists p r o d u c t s from activated c h a r c o a l t o vibrators, many of t h e m exclusive w i t h us. O u r p r i c e s are f a i r ; d e l i v eries p r o m p t . Why not make us your s o u r c e ?
Chemical Research Services, Inc. 1.243
852 Westgate Drive · Addison, Illinois 60101 CIRCLE 75 ON READER SERVICE CARD
CIRCLE 36 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 48, NO. 1, JANUARY 1976 · 35 A
