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^ROALOX GRINDING JARS
EIGHT SIZES - from V4 pint to 6V2 gallons. Also steel or stainless steel jars, unlined or lined with rubber.
EXTRA Wear-Life. Rugged, Burundumfortifled j a r body gives double the wear-life of ordinary jars. EXTRA Strength. Higher impact resistance reduces chipping and breakage under most severe grinding conditions. EXTRA Purity Per Batch. Lower silica content and greater wear resistance result in less contamination of product. EXTRA Time Saved. Extra wide mouth speeds loading. Lid and lock are one unit for fast, easy opening and closing. 102-F
.SSF%>
PROCESS EQUIPMENT DIVISION
U. S. S T O N E W A R E AKRON 9 , OHIO
M o r e modern laboratories
choose
"U.S." CHEMICAL PORCELAIN SINKS Fig. 584-SP, standard double drainb o a r d cast porcelain sink w i t h 8 " h i g h splash back.
W h y ? Because these are sinks t h a t m a t c h t h e m o d e r n laboratory's r e q u i r e m e n t s for superior corrosion resistance, beauty a n d ease of m a i n t e n a n c e today . . . plus proven durability and trouble-free service for t h e years ahead. "U.S." Laboratory Sinks a r e solid, corrosion-resistant chemical porcelain right through . . . t h u s , c a n safely h a n d l e t h e most severe corrosives. T h e special porcelain body enables these sinks to withstand any h e a t shock they m a y encounter. Cast i n rugged one-piece construction without seams or joints, they h a v e smoothly r o u n d e d corners for easiest cleaning . . . a m o d e r n , glass-smooth gray glaze finish that retains its attractive sanitary a p p e a r a n c e . Can't peel or chip off . . . a n d because it's completely non-absorbent a n d non-staining, it never needs h o n i n g or scouring. These sinks a r e available i n a wide r a n g e of s t a n d a r d types a n d sizes for p r o m p t delivery. Check with your Laboratory F u r n i t u r e Dealer today a n d compare t h e u n i q u e , high-quality features of "U.S." Chemical Porcelain Sinks . . . or write direct for fully illustrated Catalog L-8.
CHEMICAL CERAMICS DIVISION
U. S. STONEWARE
28 I F For further information, circle numbers 46 A-1, 46 A
·
ANALYTICAL CHEMISTRY
AKRON 9 , OHIO 46 A-2 on Readers' Service Card, page 103 A
NEWS behalf of the Society for Analytical Chemistry. I t was held under the patronage of the International Union of Pure and Applied Chemistry. Approximately two thirds of the papers were devoted to classical microchemistry including carbon, hydrogen, nitrogen, and similar analyses by modified Pregl techniques and one third modern analytical chemistry. Industrial representatives outnumbered the academic persons. Among those present were several from the Soviet Union, Hungary, Poland, Yugoslavia, and Czechoslovakia. Plenary lectures were given by Fritz Feigl of Brazil, Hans Lieb of Austria, Anton A. Benedetti-Pichler of the United States, and Ronald Belcher of Great Britain. A wide variety of subjects were covered in the 7-day meeting. These included inorganic and organic qualitative and quantitative analysis, physical constants, biochemical methods, absorption and emission spectroscopy, chromatography and ion exchange, chromatography, gravimetric and thermogravimetric methods, titrimetric methods, polarography, complexometric titrations, radiochemistry, chemical microscopy, industrial applications, and applications to education. After each talk, an almost equal time was devoted to discussions. Among the reports presented by scientists from the East were discussions of the relationship between organic structure and polarographic behavior by P. Zuman of Czechoslovakia. W. Kemula of Warsaw presented an interesting report on the uses of the hanging drop electrode for determination of trace quantities of metal ion. By his technique, concentrations of 10~8 per liter could be determined easily and, under favorable conditions, it appeared probable that as little as 10"10 mole per liter could be measured. A total volume of only 1 ml. is required. Thus, sensitivities with this electrode were of the order of 103 to 105 greater than those attained by conventional polarography. Rudolf Pribil of Czechoslovakia, who is working on the synthesis of metallochromic indicators and their applications to metal analysis, reported the use of orthophenathrolene as a masking agent. Demonstrations. One feature of this meeting not encountered at most American technical meetings, is that of demonstrations of working models by some who attend. Simplicity and rapidity characterize most of these items. Such demonstrations allow interested persons to learn the little tricks useful in carrying out useful analyses.
