VOLUME 2 0, NO. 8, A U G U S T 1 9 4 8 29 A

HELLIGE TURBIDIMETER A TURBIDIMETER WITHOUT STANDARDS

4*α* MEASUREMENT OF TURBIDITY (SiOî)

DETERMINATION OF SULFATE (S04)

AND OTHER APPLICATIONS

The Hellige Turbidimeter is based on the Tyndall effect and, therefore, does not require any standard suspensions. ACCURATE, FOOLPROOF and UNI­VERSAL, this precise instrument is ideal for turbidity and sulfate deter­minations of water and of suspended matter in general. Turbidity measure­ment can be made down to zero-turbid water.

for busy laboratories: assay, metallurgical, industrial

Braun Direct-Driven PULVERIZER • reduces 1 lb. of ' j-inch size quartz ore to 100 mesh

in one minute!

* easy to clean.

• permanently lubricated.

• requires no skill to operate.

FOR PARTICULARS WRITE DEPT. A-8

BRAUN CORPORATION 2260 EAST 15TH ST., LOS ANGELES 21, CALIF.

SCIENTIFIC SUPPLIES CO

S e a t t l e , W a s M n g t o r

TODD SILENT BURNER, an Outstanding Development in the field of glass blowing technology. It brings to laboratory technicians a new design of silent burner which is very easy to operate, and yet, has all the versatility and range of a professional glass blower's burner.

SILENT OPERATION is obtained by the perfect blending of the gases within the burner to give essentially 100% com­bustion efficiency with maximum economy of gases.

WITHOUT CHANGING BURNER TIPS and with only three valves, it is possible to instantly produce extremely hot flames, which range from a sharp, short needle point to a very wide brush.

ALL TYPES OF GLASS, especially Pyrex, may be readily worked.

VARIOUS GASES, such as, artificial, natural or tank gas, with pressures as low as 0.2 lb. per sq. in., can be used with oxygen in this burner.

OTHER USES—Many other types of laboratory heavy duty heating operations, such as, crucible ignitions, ore fusing, pyrolyses, etc., may be carried out by the use of the extreme high temperatures produced with this low cost burner.

TODD SILENT BURNER

(U. S. Pat. Pend.)

The rugged burner body is mounted on a heavy base by means of a ball joint which permits both lateral and vertical adjust­ments. All metal parts are corrosion resistant. Insulated fiber handles are used. Height 7". Instructions included.

Please specify type of gas to be used when ordering. $ 3 8 . 0 0

NEW YORK LABORATORY SUPPLY CO., INC. Γ6-78 V A R I C K STREET NEW Y O R K 13, Ν.Υ.

Send for Information and Prices.

H E L L I G E I N C O R P O R A T Ε D

3718 NORTHERN BLVD.. LONG ISLAND CITY 1. N.Y B R A U N - K N E C H T - H E I M A N N - C O . S a n F r a n c i s c o , C a l i f o r n i a