UP • in structural quality! • in total reliability!
NATIONAL Improved
AGKSP Spectroscopic Electrodes uniformity—Even
Advanced t e c h n i q u e s in production control of struc t u r e enable us to offer a greatly improved grade of AGKSP spectroscopic electrodes. The unretouched photomicrographs above reveal the improved uniformity of pore and particle size. Hard spots are eliminated. The s t r u c t u r e of t h e s e unsur passed electrodes is maintained throughout t h e rod— and from rod to rod and batch to batch. For all the qualities you must have for reliable reprod u c i b i l i t y - e v e r y time-order AGKSP (also SPK) elec Circle
74 A
·
ANALYTICAL CHEMISTRY
more
dependable
results
t r o d e s in t h e i r new 6-in. l e n g t h . R e m e m b e r , every package contains a s t a t e m e n t guaranteeing 6 ppm maxi mum impurities—99.9994 p e r c e n t PURE! Ordertoday!
"National" and " N " and Shield Device are registered t r a d e - m a r k s of
UNION CARBIDE
No. 2 on Readers' Service
UNION CARBIDE CORPORATION CARBON PRODUCTS DIVISION 2 7 0 Park A v e n u e , New York, Ν. Υ. 10017 In C a n a d a ; Union C a r b i d e C a n a d a Limited, T o r o n t o
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