V O L U M E 2 1 , N O . 12, D E C E M B E R 1 9 4 9 29 A

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0ÎHMIHE pH, CHLORINE,

PHOSPHATE with α

TAYLOR COMPARATOR SO EASY . . . simph |>ia<;t; tin-reagent treated sample in the center tube in the base with untreated samples in the flank­ing tubes- Just move the color standards slide across until the colors match and . . .

. nil the one typ**

SO CON V EM EXT AM) ACCURATE- . Taylor Color Standards necessary for an> of comparison arc sealed in a single, molded plastic slide. Thus difficult} and danger of handling delicate single standards is eliminated. Slide and base are easily carried in one hand for on-the-spot determinations which

usually require less than two minutes to complete, \ccuraey is assured since all Tavlor Liquid Color Standards carry an unlimited guarantee against fading.

G E T T H I S F R E E B O O K Contains 96 pages of authoritative infor­mation for 34 basic industries. Discusses Taylor methods and equipment. Write for your copy--see your dealer Tor equip­ment.

Low-Cost Immersion Heaters Automatic...Safe...Ready to Use A handy, portable heating

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device built of acid resistant stainless steel. Safety cut­out prevents element from over-healing or burning out when out of solution.

E C O N O M I C A L . . . A l l units operate on 110 v. A C 1000 watts. 9.5 amps. Immersion type thermostat integrated in unit guarantees positive temperature control to within plus or minus 1 °F.

Immersion heater installed in tank. Can be used as portable stirrer or attached to side of receptacle, as illustrated, by means of convenient clip. This at­tachment is an integral part of unit.

Cat. No. X-9S0 X-921 X-922 X-923 X-924 X-925

PRICES Heating Element

5" 8"

10" 15" 20" 48"

Specify 115 y. or 230 ». — AC only

Price 110.95

16.50 17.50 18.95 21.95 32.95

Klett.... Photometers

KUtt-£iMfUH&lAOH.

PUoioelecitic QlcM. Cell

Golotimete*

No. 900-3

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Ko. 2070

Designed for the rapid and accurate d e t e r m i n a t i o n of th iamin, riboflavin, and other substances which fluoresce in solut ion. The sensitivity and sta­bility are such that it has been found particu­larly useful in determining very smal l amounts of these substances.

J L KLETT SCIENTIFIC PRODUCTS

ELECTROPHORESIS APPARATUS · BIO-COLORIMETERS GLASS ABSORPTION CELLS · COLORIMETER NEPHELOM-ETERS · GLASS STANDARDS · KLETT REAGENTS

Klett Manufacturing Co. 179 E A S T 8 7 T H S T R E E T , N E W Y O R K , Ν . Υ,

W.A. TAYLOR

GENERAL LABORATORY SUPPLY COMPANY 32Q " M A R K E T S T R E E T I > A " l F R S O N S, N E W J l i R S t i V

<^4-ypata(ti,\ and (^•ItenacalA ret — *ηΛηΑΪτι/ and Guetta

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AND CO.

7302 YORK RD. · BALTIMORE-4, MD.