20 A

MODEL Β

BECKMAN SPECTROPHOTOM NOW AVAILABLE WITH

FLAME ATTACHMENT A moderate priced, precision in -

strumentfor rapid routine analysis by both absorption and flame meth­ods.

Particularly recommended for clinical determinations such as sodium and potassium, and for tvater analyses and other similar determinations.

Requires only 1 to 3 ml of sola -tion such, for example, as undi­luted serum.

SPECTROPHOTOMETER, Beckman Glass Prism Model B, range 320 to 1000 mmu, with wavelength scale approximately 220 mm long, graduated from 320 to 1000 mmu, readable and reproducible to 0.5 mmu in the ultraviolet and to 1 mmu in the visible range with absolute accu­racy within 5 mmu. An effective band width of 5 mmu or less can be obtained over the spectral range 320 to 625 mmu. 9087-C

Model Β is provided with a high resolution monochromator which gives a continuous selection of wavelengths with resolving power sufficient to separate completely most of the easily excited emission lines, and which is free from scattered radiation, thereby minimizing interferences. Because of this high resolving power and of the high light output of the torch type burner flame of the Flame Attachment, sodium and potassium are easily detected when present in concentrations as low as 0.1 ppm. Calcium and magnesium can be detected in concentrations as low as 1 ppm and 10 ppm, respectively. Reproduci­bility of ±0.5% is obtainable for individual readings and of 0.2% for the average of several readings.

Average measurements require only 1 to 3 ml of dilute or concentrated sample or standard dissolved in either aqueous or non-aqueous solvents. The solution is drawn up through a straight palladium capil­lary and sprayed directly into the flame. No air supply is required. 9087-C. Spectrophotometer, Beckman Model B, with Flame Attachment, complète assembly as shown in above illustra­

tion, consisting of 9091-C Spectrophotometer, 9092-E Red-Sensitive Phototube and load resistor mounted on back plate, and 9098-A Flame Attachment 1,170.00

NOTE—Acetylene and Oxygen gas eylinders with reducing valves and gauges, required for operation of the burner, should be in­stalled by a local bottle gas company in accordance with regulations.

9091-C. Spectrophotometer, Beckman Model B, only, range 320 tend the range to 1000 mmu, as required for detection to 700 mmu, with Blue-Sensitive Phototube Assembly ι o f Potassium 42.50 and set of four plastic cells for 10 mm light path and ex- | 9098-A. Flame Attachment, only, with acetylene-oxygen burner t . , , ., . . . .. c ^, assembly, rigid mounting platform to maintain proper ternal constant voltage transformer for operation of the , alignment with the spectrophotometer, and auxiliary lamp and amplifier from 115 volta, 60 eye, a.c. . 732.50 j control panel with regulators and gauges for maintaining

| precise control of oxygen and fuel pressures 395.00 90O2-E. Red-Sensitive Phototube Assembly and load resistor 9168-A. Manual of Clinical Procedures, by John W, Mehl, 54 pp.

mounted on back plate; for insertion in 9091-C to ex- 5.00

More detailed information sent upon request.

ARTHUR H. THOMAS COMPANY LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA.

Teletype Services: Western Union WUX and Bell System PH-72

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