VOLUME
2 0, N O .
12, D E C E M B E R
PHOTOVOLT Line-Operated Electronic
pH METER
A truly universal • • • • • •
PHOTOVOLT CORP. Colorimeters Fluorescence Meters
New York 16, Ν. Υ. Reflection Meters Densitometers
improved
SPECIFIC GRAVITY BALANCE
FEATURES
Knob controlled Beam Arrest Knob controlled Vernier Leveling screws No loose weights Sensitive to 0.0001 3 DISTINCT USES
Vitreosil (Vitreous Silica)
NEW
instrument
for laboratory and industrial application for all types and designs of electrodes for p H , titration, and oxidation-reduction potentials for all A C power lines 90-375 volts 50-60 cycles available with or without portable wooden housing furnished with shielded glass electrode, available also with shielded compartment for unshielded electrodes
95 Madison Avenue Also
37 A
1948
/
For specific
gravity
of
liquids
W h e n erected as shown a b o v e , the specific g r a v i t y o f liquids m a y b e r e a d
LABORATORY WARE
directly t o the fourth decimal place. one roller t y p e r i d e r is r e q u i r e d .
N o calculations a r e necessary.
convenient o p e r a t i o n a n d precise control.
. . . A superior re placement foi por celain and glass and a satisfactory substitute for plati num in many cases. Greater chemical purity and high re sistance to heat shock as compared to other ceramics and low initial cost compared to plati num have led tc the universal adop tion of VITREOSIL as a substitute for platinum, porcelain and other materials in many analytical and research procedures. • Standard items cf VITREOSIL Laboratory Ware include glazed and unglazed crucibles, evaporating dishes, beakers, trays, tubing and conductivity water stills. Write for Technical Bulletins descriptions, specifications,
giving full and prices.
The base is e q u i p p e d with l e v e l
ing screws a n d a spirit l e v e l .
2
For specific
gravity
of
solids
A f t e r substitution o f the plummet with the slotted basket, four quick easy weighings furnish all the
TiFC
data
t o determine the specific g r a v i t y o f a n y solid.
necessary
W i t h water-
soluble solids, other liquids such as benzene or petroleum may be used.
3
As a chain
balance
A b o w p a n is a v a i l a b l e at slight e x t r a cost to convert the b a l a n c e into one f o r weighings of not more than 2 0 grams with a sensitivity o f 10 milligrams. A 4 - 0 1 2 Specific gravity b a l a n c e for liquids a n d solids, as described a b o v e ,
$140.00
A 4 - 0 1 4 Bow pan f o r converting balance t o chainomatic type
7.50
E. MACHLETT & SON ESTABLISHED 1 8 9 7
THE THERMAL SYNDICATE, LTD. 12 EAST 4 6 t h STREET, N E W YORK 17, N . Y .
Only
The chain is w o r k e d b y a knob o f f e r i n g
Laboratory Apparatus · 220 EAST 23RD STREET
Supplies · Chemicals NEW YORK 10, Ν. Υ.
