44 A
ANALYTICAL
CHEMISTRY
LaMOTTE TITANOUS SALTS
FARRAND ELECTRON MULTIPLIER
PHOTOMETER For PRECISE Measurements of Low Light Intensities • • • • • • •
Titanous Chloride and Titanous Sulfate are the most powerful reducing agents t h a t are stable in solution form and, therefore, find wide use in laboratory reductions and especially in quantita tive analysis. These solutions are prepared ac cording to the specifications of D r . W. M . Thorn ton, J r . T i t a n o u s Chloride, 2 0 % S t a n d ardized solution T i t a n o u s Sulfate, 2 0 % S t a n d ardized solution
$3.30
4.40
250 cc.
500 cc.
$0.60
$11.55
8.80
15.40
Selective W i d e Range of Sensitivity U l t r a v i o l e t a n d Visible Regions Linear Response D a r k Current Balance Control I n t e r c h a n g e a b l e Tubes Constant V o l t a g e Compact, Simple t o O p e r a t e
T h e Farrand Electron Multiplier Photometer is widely used in university, industrial and hospital laboratories for critical measurements at very low light levels. Λ list of users and complete details of design, operation and performance may be h a d by writing for Farrand Bulletin # 8 0 4 . PRECISION
OPTICS. ELECTRONIC
FARRAND OPTICAL CO., Inc.
THE WACO
Towson, Baltimore 4, Md.
V
LABORATORY
POWER
•
SCIENTIFIC • INSTRUMENTS^™
LaMOTTE CHEMICAL PRODUCTS CO. Dept. AC
• • •
AND
B R O N X BLVD. a n d EAST 2 3 8 t h ST., N E W YORK 7 0 , N . Y .
SUPPLY
CENTER
STIRRER
LABORATORY SERVICES Vitamin and amino acid assays Proximate analyses and mineral determinations Food chemistry and microbiology Screening of compounds for insecticidal, fungicidal, and bactericidal properties Warm-blooded toxicity studies Other biological, chemical, and microbiological services
If y o u a r e i n t e r e s t e d i n h e a r i n g a b o u t t h e success which
others
have h a d
the
Directory
through pages
of
AC
and
the
Write for price schedule
WISCONSIN ALUMNI RESEARCH FOUNDATION FOR EVERY STIRRING NEED Geared Power Pro vides The 2 Speeds You Need Fully enclosed, nonsparkii'ns fan cooled . . . You may expect TEN years' service! Ask A N Y nationally known chemical laboratory or university organic department. ORDER TODAY! N o . AC-2-7292 N e w W A C O Power Stirrer for 1 1 0 V . A . C . Two H" shafts, 300 and 600 RPM $23.75 (Chuck $1.25 extra. N o . AC-2-7292) LABORATORY SUPPLIES AND CHEMICALS WILKENS. ANDERSON CO. 4525 W. DIVISION CHICAGO 51, ILL
P. Ο BOX 2059, MADISON 1 , WISCONSIN
REAGENT TABLETS . . . TO YOUR ORDER If your procedures require routine weighing of small quantities of reagents, perhaps these can be dispensed more conveniently in tablet form—with assured uniformity and great saving of time . . . also an economical way to dispense very expensive reagents. We specialize in small-lot tablets to order. Write us about any problem along this line. R. P. CARGILLE LABORATORIES, I N C . 117 Liberty St. Dept. AC-RT N. Y. 6, Ν . Υ.
YOUB ANNOUNCEMENT of Equipment for Sale can carry YOUR MESSAGE to the readers of the leading publication in the chemical process industries. Rates on request. ANALYTICAL CHEMISTRY Advertising Office: 330 West 42nd Street New York 36, Ν . Y.
other American Chemical Society p u b l i c a t i o n s , let us know.
Any Reinhold
Representative
will
be
happy to show you how you,
too,
can
have
a
"success s t o r y " of y o u r own, a t low cost.
