28A
ANALYTICAL
CHEMISTRY
K E R N FULL
CIRCLE
POLARIMETER . . . for accurate de termination of sugar and other optically active substances.
V I T R E O S I L (Vitreous Silica)
LABORATORY WARE
PRICES REDUCED!
For use by chemists and physicians, and in hospitals, research laboratories and factory
On November 15, 1949, the prices of VITREOSIL (Vitreous Silica) tubing, rod and transparent laboratory ware were reduced by 20%. Also, glazed laboratory ware prices have been cut back to former level. With prices as low or lower than in the past 30 years, VITREOSIL is a better buy than ever.
laboratories
for
accurate
determination
of
sugar and other optically active substances. Fitted with a Laurent quartz lamella through which degrees
two
beams
of
light
of polarization
with
different
reach the field
of
vision. The field of vision is divided into three sections instead of the usual t w o , the t w o external sections being equally illuminated while the
VITREOSIL (Vitreous Silica) laboratory ware is a superior replacement for porcelain and glass and a satisfactory substitute for platinum in many cases. Greater chemical purity and high resistance to heat shock as compared to other ceramics and low initial cost compared to platinum have led to the universal adoption of VITREOSIL as a substitute for platinum, porcelain and other materials in many analytical and research procedures.
middle strip forms the surface of contrast. Three-part division not only speeds up work but increases accuracy in measuring rotations up to 180° plus or minus. The
graduated
circle
is divided
into
half
degrees, and in combination with the vernier enables readings of 0 . 0 5 ° and estimates of 0 . 0 1 ° to be made. The instrument is equipped with three tubes;
Standard items of VITREOSIL Laboratory Ware include transparent, glazed and unglazed cruci bles, evaporating dishes, beakers, tubing, etc.
100 m m . and 2 0 0 m m . for general use, and 9 5 . 0 4 m m . for determination of glucose. Complete with three tubes in wooden c a s e . . $333.65
Write for Technical lull descriptions, and prices.
Bulletins giving specifications,
T H E C H E M I C A L R U B B E R CO. Scientific Equipment, Analytical Chemicals, Laboratory Supplies
THE THERMAL SYNDICATE, LTD. 12 East 4 6 t h St.
·
New
York
17, Ν .
Υ.
H A N D B O O K OF CHEMISTRY A N D 2 3 1 0 Superior A v e .
·
PHYSICS
Cleveland 14, Ohio
