VOLUME 2 0, NO. 10, OCTOBER 1948 35A Power FOR EVERY STIRRING NEED BETTER THAN EVER . . . the NEW WACO Power Stirrer replaces the "war model" 7292S. It is more powerful and the NEW WACO will run hour after hour . . . without overheating! The Weer Retainer Ring positively prevents oil leakage. EVER READY . . , through positive gear reduction and a new powerful induction motor, the WACO POWER STIRRER guarantees service when needed! NO BRUSHES —NO SPARKS . . . inflammables are safely stirred with the WACO! In the organic class, all needs are adequately satisfied with the two shafts, one at 300 R. P. M. and the other at 600 R. P. M. This eliminates rheostats and speed control devices. INDUSTRIAL laboratories, such as E. I. du Pont de Nemours, General Electric, Abbott Laboratories . . . Massachusetts Institute of Technology, Universities of Wisconsin, Chicago, Boston, Montana . . . now use the NEW WACO Power Stirrer! No. AC7292. NEW WACO POWER STIRRER, for 110 volts A.C. only. Shafts M inch diameter, one 300 R. P. M. and the other 600 R. P. M. With connecting cord through support rod. Each $23.75 If heavy rubber tubing or rubber stoppers are not used to hold stirrer rods, CHUCK No. 7292AC at $1.25, is available. WILKENS-ANDERSONCO. Ill NORTH CANAL STREET · CHICAGO, ILLINOIS Υ No. 40 For Medium Precipitates As an all around quantitative filter pa- per WHATMAN No. 40 is extremely popular with large numbers of chemists and laboratory technicians. No. 40 will retain all but the finest precipitates, filters fairly rapidly, burns easily and has a low and constant ash. No. 40 is particularly popular in steel mills, aluminum plants, cement mills, chemical factories, fertilizer plants and in all laboratories where large numbers of analyses must be made quickly and accurately. Its efficiency is enhanced for many determinations by the addition of ashless pulp made from WHATMAN Ashless Tablets or Accelerators. No. 40, like all WHATMAN Filter Papers and related products is available promptly from all dealers in laboratory supplies. Samples of all WHATMAN products will be supplied on request without obligation. H. REEVE ANGEL & CO., INC. 52 Duane St., New York 7, Ν. Υ. WHATMAN FILTER PAPERS WHATMAN

WILKENS - ANDERSON CO

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V O L U M E 2 0, N O . 10 , O C T O B E R 1 9 4 8 3 5 A

Power FOR EVERY

STIRRING NEED

BETTER THAN EVER . . . the NEW WACO Power Stirrer replaces the "war model" 7292S. It is more powerful and the NEW WACO will run hour after hour . . . without overheating! The Weer Retainer Ring positively prevents oil leakage.

EVER READY . . , through positive gear reduction and a new powerful induction motor, the WACO POWER S T I R R E R guarantees service when needed!

NO BRUSHES — N O SPARKS . . . inflammables are safely stirred with the WACO! In the organic class, all needs are adequately satisfied with the two shafts, one a t 300 R. P . M. and the other at 600 R. P . M. This eliminates rheostats and speed control devices.

INDUSTRIAL laboratories, such as E. I. du Pont de Nemours, General Electric, Abbott Laboratories . . . Massachusetts Insti tute of Technology, Universities of Wisconsin, Chicago, Boston, Montana . . . now use the NEW WACO Power Stirrer!

No. AC7292. NEW WACO POWER STIRRER, for 110 volts A.C. only. Shafts M inch diameter, one 300 R. P . M. and the other 600 R. P . M. With connecting cord through support rod. Each $23.75

If heavy rubber tubing or rubber stoppers are not used to hold stirrer rods, CHUCK No. 7292AC at $1.25, is available.

WILKENS - ANDERSON CO. I l l NORTH CANAL STREET · CHICAGO, ILLINOIS

No. 40

For Medium Precipitates As an all around quantitative filter pa

per WHATMAN No. 40 is extremely popular with large numbers of chemists and laboratory technicians. No. 40 will retain all but the finest precipitates, filters fairly rapidly, burns easily and has a low and constant ash.

No. 40 is particularly popular in steel mills, aluminum plants, cement mills, chemical factories, ferti l izer plants and in all laboratories where large numbers of analyses must be made quickly and accurately.

Its efficiency is enhanced for many determinations by the addition of ashless pulp made from WHATMAN Ashless Tablets or Accelerators.

No. 40, like all WHATMAN Filter Papers and related products is available promptly from all dealers in laboratory supplies.

Samples of all WHATMAN products will be supplied on request without obligation.

H. REEVE ANGEL & CO., INC. 52 Duane St., New York 7, Ν. Υ.

WHATMAN FILTER PAPERS

WHATMAN