Watt - Governor Speed
Controlled
LABORATORY STIRRER LONG
LIFE—QUIET
OPERATION
SPARKLESS Induction Motor Eliminates the Explosion Hazard from Brush Contacts. L T. HALLETT, Science Editor.
• Delicately Adjustable Speed Range (200 to 1400 R.P.M.)
THE warmth of Kansas City's welcome more than compensated for the cold weather. Publicity and ar rangements for the 125th ACS meet ing were excellent. Comments on the extended 10-day meeting with an inter vening week end seemed to be about equally divided between the yeas and nays. The arrangements do make for a less crowded meeting, and, if the majority of your interests coincide with program arrangements, it is an ideal plan. The Analytical Division's two-day session was rather short compared to other meetings. Actually there was only one day of general papers; the other was devoted to requested papers by former associates and students honoring G. Frederick Smith, this year's Fisher Award winner. While symposia were planned, they had to be abandoned because prior commitments made it impossible to secure chairmen and speakers to undertake such an as signment. I t is true that analytical meetings outside our national meeting are grow ing apace and offer some competition. We feel that this is just a sign of how fast and important analysis has become and that numerous and competing pro grams are in order. We believe that the shortness of the analytical sessions that were held at Kansas City was probably due to a unique combination of circumstances. Even if this be true, it does make one pause and reflect that the success of the division (and it is true of every suc cessful venture) has been due to a hard hitting and far-seeing executive group. More important, such a group must anticipate changing conditions and initiate new programs which so stimu late divisional interest that analysts feel they cannot afford to miss partici pation in them.
• Speed Stabilized by a Watt Governor— Eliminates Rheostats, Gears, or Friction-Drive Disks. • Thrust Ball Bearings Insure Long Life under Continuous Running. • Uniform Power Output. No. 5230.
NON-SPARKING MOTOR STIRRER. 60-Cycle, 1 1 O-volt A.C. Circuit
No. 5230A.
Similar to No. 5230 but for 220-volt, 60 cycle A.C. circuit. transformer from 220 to 11 0 volts is provided in the line.
Each $ 4 3 . 5 0 A "stepdown'· Each $ 5 4 . 7 5
W. M. WELCH SCIENTIFIC COMPANY DIVISION OF W. M. WELCH
MANUFACTURING
ESTABLISHED 1880 SEDGWICK STREET, DEPT. A-l
COMPANY
1880—— CHICAGO 10, ILLNOI, U. S. A.
For further information, circle number 13 A-1 on Readers' Service Card, page 49 A
FREEZE-DRY APPARATUS This economical self-contained unit is ideally suited for freeze-drying operations up to 500 ml. Standing only 2 1 " high, it has a built-in dry ice and solvent chamber and three conveniently located ground, standard taper drying ports around its lower periphery. Standard size for joints is f 3 4 / 4 5 , but special sizes can be ground to your specifications. E36-695 Machlett All-Gloss Freeze-Drying Unit with support stand and rings, four flasks, 100, 200 or 250 ml capacity $64.00 E36-695A Machlett Freeie-Drying Unit only $42.00 E36-695B Freeie-Drying Flasks 100, 200 or 250 ml $ 3.00 E36-695F Support Stand and
rings
$10.00
A l l prices F. Ο . Β. New York, Ν . Y.
For further information write for Bulletin F-D.
E.MAHLETT & SON
220 East 23rd Street · New York 10, N.Y.
LAST month we wrote about the new in strument developments disclosed at the VOLUME
2 6, N O . 4, A P R I L
1954
APPARATUS
·
SUPPLIES
·
CHEMICALS
For further information, circle number 13 A-2 on Readers' Service Card, page 49 A
13 A
ANALYST'S COLUMN Pittsburgh Analytical Conference, espe cially those pertaining to spectrophotom eters. Frederick Brech, director of research for the Jarrell-Ash Co., chose to' an nounce his latest creation in spectro photometers before the Analytical Divi sion. This instrument, like so many, first had its inception in the research work of David Glick, Department of Physiological Chemistry, University of Minnesota. His researches, like others in this field, deal with secretions such as those from the adrenal glands which are present in very small volumes. Spectrophotometric studies on these samples are important but difficult, because instru ments of present-day design have not centered around small volumes, even though many of them have made adap tations. Glick and Brech had small volumes primarily in mind, even though larger volume cells can be used. It is a double-beam spectrophotometer which will handle samples as small as 0.01 ml. with an accuracy of 3.5 parts per billion. A cut of the instrument appears on page 24 A. The optical system of the instrument comprises a pair of matched mono chromatic beams emanating from an /4.5 grating monochromator. Each beam passes through a semiconical cell, one of which contains the reference solu tion and the other contains the sample. The beams emerging from each cell fall upon a photomultiplier, the output of which is amplified logarithmically. In addition to its use in studies of gland secretion, it can, of course, be used for determination of traces of metals in biological systems and im purities in drugs. Because the instru ment is so sensitive, Brech feels that it may also be applied in microdeterminations of corrosion products that are formed in jet engines, with much shorter periods of operations of the engines on test stands than hitherto has been necessary to obtain samples of adequate quantity. Work now going on is expected to iron out a few minor "bugs" and allow at tainment of accuracies within 1 part per billion. When these improvements have been completed, which should be within a few months, the instrument will be marketed, in a nonrecording version, and later a recording model will be added. Both models will be reasonably priced. V O L U M E 26, NO. 4, A P B I L
1954
Now! Nalge puts Polyethylene stopcocks on Polyethylene Carboys and Bottles for dispensing acids, alkalis, many organics
UNBREAKABLE...PERMANENT...LIGHTWEIGHT The new Nalgene* polyethylene bottles are blow-molded in a single piece by Plax Corp. and Nalge applies the leak-proof, trouble-proof Polyethylene stopcocks for your convenience. 3
SIZES
AVAILABLE
The 2 gallon bottles are fitted with a Vi" needle-type valve made entirely from polyethylene. This valve is welded permanently to the bottle thru the m e a n s of a supporting boss. The βΥζ and 13 gallon carboys are fitted with a V2" polyethylene stopcock type valve, threaded to the bottle thru a welded-in boss. A threaded stopper is available for the 6V2 and 13 gallon bottles to screw in place of stopcock for convenience in handling or shipping. *Brand name for Nalge's Polyethylene w a r e .
The
PRICES
NALGE CO. Sherwood Building Rochester 2, New York
Catalog No. 7208 Size Each
lofs
1 gallon
lofs lofs 10-24 25 $23.00 $21.70 $19.50 $18.60 $17.65
6V2 gallon
$46.00 $42.00 $37.80 $36.00 $34.20
1 3 gallon
$55.00 $51.00 $47.50 $45.80 $43.60
Lots 2-3
4-9
Screw Plugs for the 0V1 and 13 gallon carboys $1.00 each.
We're showing many new things - let us show them to you. Ask for the Nalge complete polyethylene listing. For further information, circle number 15 A on Readers' Service Card, page 49 A
15
A
