! the ANALYST'S I column l
L.T. H a l l e t t , E d i t o r
γ\7"κ KXOW t h a t chess is played via mail, telegraph, a n d radio between players located in various p a r t s of t h e world. W e were u n aware t h a t it was practical t o do cooperative research under similar conditions until we received a paper authored b y research workers t h o u sands of miles apart. T h e details of this interesting effort wore brought t o light when one of our manuscript editors was checking on t h e proper w a y t o set up t h e names a n d addresses on t h e title page. I t seemed unusual t h a t a research project was carried out simultaneously in laboratories in Auckland. N e w Zealand, a n d Bethesda, M d . T h e paper, entitled "Infrared Absorption Spectra of Methylenedioxy a n d Aryl E t h e r G r o u p s , " was a u t h o r e d b y L. H . Briggs a n d L. D . Colebrook, Auckland Uni versity College, a n d Η . Μ . Fales a n d W. C. Wildman, National H e a r t I n s t i t u t e (ANAL. C H E M . , J u n e 1957, page 904).
Self-Contained Hot-Wire-Type
GLASS TUBING CUTTER Produces Clean, Straight Breaks in Tubing up to 3 Inches in Diameter Glass tubing bottles or jars up to 3 inches in diameter can be cut neatly and quickly with this cutter. Soft glass, Pyrex-brand glass, or other hardglass tubes can be cut with equal ease. The article is first encircled with a scratch made by a cutter wheel conveniently mounted on the side of the trans former, the scratch is heated by contact with t h e hot wire, and then cooled quickly by applying water or by blowing on it. No other equipment is required. The cutting wire is supported on two insulated posts and is heated by current from a 12-volt trans former serving as the base. Xo. 24 (B & S gauge) niehrome wire is used, and is easily replaced. Three extra wires are included. By means of an adjust ment on the transformer, the current can be con trolled to give the optimum heat for whatever type of glass m a y be used. An instruction plate is mounted near this control. The unit operates on 115 volts, 50 or 60 cycle A.C. Over-all dimensions are 6 χ 4 ι / 2 χ 9 inches high.
Each, $29.50 D I V I S I O N OF W . M. W E L C H M A N U F A C T U R I N G COMPANY
1515
Neither we, nor D r . Wildman, rec-
Ε STABLISHED 1880 — SEDGWICK STREET, DEPT. A - 1 , CHIC A G O 10, ILLINOIS, U.S.A. Manufacturers of Scientific Instruments and Laboratory Apparatus
NEW
TEMCO FLASK HEATER
m
We asked D r . Wildman for t h e details. Here is w h a t he said: Our writing this joint paper was brought about by a third party, Dr. Johnathan Hartwell of the National Cancer Institute. Dr. Hartwell had been corresponding for some time with Prof. Briggs in New Zea land on other research matters. In one letter Prof. Briggs mentioned that he was working on an infrared method to determine mcthylenedioxy and methoxyl groups. I n discussing several research problems in which the Heart and Cancer Institutes had common interest, Dr. Hartwell mentioned Prof. Briggs' re search problem. Since we were well under way in a similar problem, we agreed to do the paper jointly. I t was not an easy task, since we were not able t o have any long discussions about t h e work. One would mention an idea in a letter and a few facts t o support it, then t h e other would follow it up and do more research which would be reported back. This in turn created new ideas and away wc went.
5210
W. M. WELCH SCIENTIFIC COMPANY
already tests
and
proved
by
nationwide
"in-use" acceptance
Here's the g r e a t l y improved flask heater with inter changeable Monel mesh baskets that perfectly "nest" your flasks . . . a n d let y o u use several sizes in the same unit! Radiates h e a t uniformly t o lower h a l f o f flask . . . mini mizes " b u m p i n g . " Easily r e p l a c e a b l e heating element eliminates time a n d use losses. N o fabrics t o become shoddy, s a t u r a t e d , or worn. Heating chamber seated t o contain accidental spillage . . . easily c l e a n e d . TEMCO Flask Heater is r u g g e d l y built with stainless steel a n d buffed aluminum double-case construction. W e l l - v e n t i l a t e d . . . p e r f o r a t e d outer shell never t o o hot to handle . . . t a b l e - t o p heat-protected attached support bracket. M a y be used with control unit shown below, o r with other makes of controllers. Two models for a l l p o p u l a r flask sizes: $22.50 and $ 3 4 . 5 0 . Several different flask sizes can b e used in this unit.
New
Controller for extremely fine control of flask heaters
M o d e l 7 0 0 Temcometer p o w e r i n p u t c o n t r o l l e r of " o f f - o n " t y p e w i t h c o m p l e t e l y stepless c o n t r o l end short time c y c l e . Permits e x c e p t i o n a l l y fine s e l e c t i o n , close h o l d i n g of d e s i r e d temperature. C o m pensates automatically f o r w i d e fluctuations in voltage. Ideal c o m p a n i o n unit f o r T E M C O Flask Heaters and other makes of heaters and mantles. Price c o m p l e t e w i t h p o w e r a n d c o n n e c t i n g c o r d s , $20.85.
Q u a l i t y is assured under the T E M C O l a b e l . Write
for complete
data
and name of nearest
dealer.
THERMO ELECTRIC MANUFACTURING CO. 478
HUFF ST., DUBUQUE, I O W A For further information, circle number 43 A on Readers' Service Card, page 73 A
VOL.
29, NO. 7, JULY 1957 ·
43A
