20 years from now... this will still be the world's

most advanced mass spectrometer

Reason: It has been engineered to eliminate obsolescence. Because of its modular design, all conceivable future advances in the state-of-the-art may be readily incorporated with the existing instrumentation.

However, to the organic chemist, for example, the CEC Mass Spectrom­eter is far more than just a highly sophis t ica ted ins t rument . To him it represents positive solutions to the most elusive problems. For the 21-110B permits absolute structural i d e n t i f i c a t i o n of v i r t u a l l y e v e r y organic substance, natural or syn­thet ic •— and quant i ta t ive analysis of unstable and low vapor pressure materials.

Versatility T h e 21-110B p r o v i d e s c o m p l e t e versat i l i ty in mass spec t rometry . Consider these advan tages :

Highest Resolution The 21-110B assures the highest res­olution of any instrument now avail­able—guaranteed to 1 part in 30,000.

Direct Inlet System A new probe and vacuum lock sys­tem permits direct introduction of samples previously excluded from analysis.

Gas Source with combination de­tector is used for organic chemistry, molecular structure studies in foods, bio-chemicals, pharmaceuticals, cos­metics, chemicals, petrochemicals.

RF Spark Source with photoplate detector locates trace impurities (less than 1 part in 10,000,000) in metals, semiconductors and other solids.

Surface Ionization Source performs isotopic assay of uranium oxide and other similar materials.

Knudsen Cell Source with electrical de t ec to r m a k e s t h e r m o - d y n a m i c equilibrium studies, heat of vapori­zation determinations and appear­ance potential measurements.

Now you can appreciate why 90% of all mass spectrometry data has been achieved with CEC equipment.

But more important . . . why the 21-110B is considered a commercial " m u s t " for compe t i t i ve r e s e a r c h in every branch of chemistry from food, flavors and fragrances to phar­maceuticals and petrochemicals.

For complete information on the 21-HOB Mass Spectrometer, call CEC or write for Bulletin 21110B-X3.

Analytical & Control Division

CONSOLIDATED ELECTRODYNAMICS A SUBSIDIARY OF BELL & HOWELL/PASADENA, CALIF. 91109 INTERNATIONAL SUBSIDIARIES: WOKING, SURREY, ENGLAND

AND FRANKFURT/MAIN. GERMANY

8 C & E N