ARTHUR H. THOMAS COMPANY - Analytical Chemistry (ACS

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readout absorban» linear Get direct

Wi%TemannSMC4Spec,,ophotomete,

NOTE THE SENSIBLE, equally spaced absorb-

scale on this instrument. It’s graduated like a ruler, and just as easy to read. What this means to you is liberation at last from logarithmic scales ance

and charts without buying a lot more spectrophotometer than you need. Observe especially the uncrowded divisions in the often important high absorbance end of the .

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scale.

What you can read on the absorbance scale can be duplicated by a conventional recorder, using the jack on the back panel. The linear output, 0 to 10 mv corresponding to 0 to 1A, gives you the same equally spaced absorbance readings across a standard recording chart. The 20 bandpass of the grating resolves than those you usually ena lot narrower peaks counter in routine analyses; it makes you a lot more sure of the wide peaks you have. The 325

µ, range covers the upper end of the ultraviolet spectrum, entire visible range, and the lower end of the infrared. to 825

Autofill Accessory. For semi-automated procedures in routine analysis, the Coleman Autofill Attachment provides a 0.5 ml flow cell adapter with pump for rapid sequencing of samples in the Model 44. Samples are aspirated from the tubes in which they have been processed, eliminating transfer to expensive optical quality cuvettes which must be matched for reproducibility. Information supplied on request. The instrument comes equipped to take 25 X 105 mm round cuvettes. Accessories for smaller round and square cuvettes, and for flow cells, are available. Solid state circuitry operates on 90-130 or 180-260 volts, 50 or 60 cycles a.c. 9064-J60.

Spectrophotometer ......750.00

Detailed literature sent upon request.

ARTHUR

H. THOMAS

COMPANY

Scientific Apparatus and Reagents VINE STREET AT 3RD

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P.O. BOX 779

Circle No. 47 on Readers’ Service Card

150 A

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ANALYTICAL CHEMISTRY, VOL. 42, NO. 2, FEBRUARY 1970

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PHILADELPHIA, PA. 19105, U.S.A.