Metallographic
Polisher
Λ new metallographic polisher per mits the simultaneous a u t o m a t i c dia mond polishing of six samples from L'A" to 2" in diameter. E x t r a a d a p t e r s are available to accommodate smaller samples. T h e polisher can be equipped with wheels ranging to 12" in diameter. Automatic lubrication is provided the -ample mover and t h e samples are readily exchanged. William .1. H a c k e r .V Co., Inc.. P . O . Box 040, West Cald well. N . . I. 431
MEASURE ΔρΗ TO 0.0005 UNITS with Cary Model 31 Vibrating Reed Electrometer
X-ray fluorescence is used to analyze one to six elements simultaneously with this new instrument. Featuring fixed channel optics, the instrument can analyze elements in the atomic scale from titanium upward. The turn table accommodates 12 sample holders which will accept solids, liq uids, slurries, or powders. The standard sample cell will hold a IV4" diameter specimen. Operation of the unit can be by fixed count or fixed time. The system is supplied with an x-ray generator, an x-ray tube with a tungsten target, and flat crystal optics including source and detector collimators, fixed crystal, and radia tion detector. Philips Electronic In struments, 750 South Fulton Ave., Mount Vernon, Ν. Υ. 432
New data sheet on pH measurements plus details on Cary Model 31 are available by writing for Data File A233-83,
Sensitivity to 0.0002 pH units and exception ally high input resistance make the Cary Model 31 the ideal
Fluorometer
voltmeter for measuring glass electrode potentials. It draws
Λ new ratio iluorometer is available which, after a two-step calibration oper ate-; without further adjustment. T h e fluorescence ratio can be read directly from a meter, or can lie recorded by conneci.ing the instrument to any 100 mv. poteiitiomelric recorder. The -ample basket, holds eight samples; minimum -ample size is 1.3 ml. Vari ous accessories are supplied with the instrument including u r a n i u m reference glasses, applications m a n u a l , filters, and a paper strip luilde:' (for positioning chromatographic papers iti the b e a m ) . Mulletin 700!· gives details of this in s t r u m e n t . Bockman I n s t r u m e n t s . Inc.. Scientific and Process I n s t r u m e n t s D i vision, Fullcrton, Calif. 433
less than 10~16 amperes, even with input EMFs up to one
Circle No. 140 on Readers' Service Card
>
volt— especially important with easily polarized high resist ance electrodes. Drift is only 0.002 pH units per day, as suming constant temperature. Other uses for the Model 31 include radioactivity measurements (detects C14 activity to 5x10~15 curies per mg BaC0 3 ) and mass spectrometry (de tects ion currents small as 10~17 amperes), APPLIED PHYSICS CORPORATION 2 7 2 4 SOUTH PECK ROAD · MONROVIA, CALIFORNIA
Cary INSTRUMENTS
Raman/UV/IR
Recording Spectrophotometers'Vibrating
Reed Electrometers
