ANALYTICAL
32 A A n Invaluable G u i d e and Reference
CHEMISTRY
Book
RUSSIAN-ENGLISH TECHNICAL AND CHEMICAL DICTIONARY Compiled by LUDMILLA IGNATIEV CALLAHAM H e r e is a complete a n d scien tifically organized reference to 8 0 , 0 0 0 t e r m s , with a c o m p r e hensive coverage of o r g a n i c a n d i n o r g a n i c chemistry, chemical technology and mineralogy. A l s o extensively covered are metallurgy, mining, geology, engineering, physics, botany, pharmacy, and the m o r e com m o n t e r m s in agriculture, medicine, aeronautics, meteorology, a n d military science. I n addition, the b o o k includes t h o s e t e r m s that are m o s t frequently used by industrial t e c h n o l o g i s t s . 1947 794 Pages $10.00 ON
APPROVAL
Lu M ET RON Colorimeter Mod. 4 5 0 for
COUPON
IEC-4-47 J O H N WILEY & SONS, INC. 440 Fourth Ave., New York 16, Ν . Y. Please send me a copy, on ten days' approval, of Callaham's RUSSIANENGLISH TECHNICAL A N D CHEMICAL DICTIONARY. If I desire lo keep the book, I will remit $10.00 plus postage; otherwise, I will return the book postpaid.
Writt for Intrtturt
Name Address
City
N e s s l e r Tubes
A new photoelectric instrument of high accuracy for the measurement of pale colors and faint turbidities. • For all analytical colorimebic determinations in which only a slight coloration can be developed. • For sanitary examination of drinkable water and for analysis of water for municipal and industrial purposes. • For color standardization of lightly colored liquids such as kerosenes, sugar solutions, solvents, varnishes, liquid waxes, vegetable oils, beverages, cosmetics. • Replaces visual color comparison in Nessler tubes. '
to
PHOTOVOLT CORP.
State.. Approval offer not valid outside U. S.
95 Madison A v e .
New York 1 6 , Ν . Υ.
A D A M S Safety-Head Improved Model
CENTRIFUGE
As Supplied to U. S. Army and Navy
This centrifuge offers important advantages over the conventional units. The tubes are suspended at a fixed 5 2 ° angle — thus faster sedimentation is achieved by the shorter distance particles are required to travel . . . creating mass, and reaching the bottom more quickly. The tubes remain in the angular position and no stirring up of sediment results. CT-1001 A D A M S 15 ml. TUBES.
SENIOR
SAFETY-HEAD
CENTRIFUGE
Exclusive of tubes or shields
for SIX
Each $58.50
CT-1000 Same as above, but complete with six round bottom brass shields with rubber cushions and three each graduated and ungraduated taper bot tom 15 ml. glass tubes. Without protective cap or underguard
Each $64.50
CT-1055
UNDERGUARD
Each $ 3.50
CT-1050
PROTECTIVE C A P
Each $ 2.50
CT-1002 A D A M S S A F E T Y - H E A D CENTRIFUGE for six 15 ml. tubes com plete with Safety-Cap (CT-1050) and underguard (CT-1055) . Each $70.50 A b o v e centrifuges have universal motors for 110-volt A . C. or D. C. cur rent. Additional charge of $2.00 is made for 220-volt universal motors. * With underguard N o . CT-1055 with six 15 ml. tubes loaded. 4 2 0 0 R. P. M . on A . C. with same load. M I C R O and S E M I - M I C R O tubes (5 ml. to 0.5 ml.) can be accommodated by pur chasing extra shields. N o adapters are required. Other A D A M S CENTRIFUGES are described in our new literature Form 309-R3/EC. Write for a copy.
CLAY-ADAMS CO INC. 5000* R. P. M. on D. C.
•
.—_
.
,
.
| 44 EAST 23rd STREET. HEW YBRK 18, Ν. Υ.
1 ADAMS I
^ I s W
