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BUSS

Stirring Mixing Kneading Evaporating Drying Extracting Complete Plants for the Oil and Fat Industries Fluoride Plants (Cryolite and Aluminium Fluoride) Sulphuric Acid and Hydrofluoric Acid Plants Carbon Bisulphide Plants Hydrosulphite Plants Acetylene Dry Generators Steam Boilers

an entire research library in your hands . . . with MICROCARDS* T h e r e a r e c o u n t l e s s a p p l i c a t i o n s of M I C R O C A R D S in every field of science. W i t h M I C R O C A R D S , you can have, a t your fingertips, reference d a t a not other­ wise available — foreign journals, exhaus­ tive government research reports, limited edition m o n o g r a p h s — on easy-to-use, e a s y - t o - r e a d cards. T h e y do n o t s m e a r when handled, a n d t h e image remains s h a r p , clear and legible indefinitely. * A registered t r a d e m a r k . A M I C R O C A R D is an opaque 3 " χ 5 " card on which we record photographically, in miniature, as many as 80 pages of full-size docu­ ments. You can keep a complete library at hand in an ordinary card file, locate particular references easily and read t h e m clearly . . . with a magnifying M I C R O C A R D reader. A great a m o u n t of original source material is already available from M I C R O C A R D publishers. Their current catalogs are available to you on request.

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BUSS LTD. BASLE/SWITZERLAND 132 A

INDUSTRIAL AND ENGINEERING CHEMISTRY

Write today for more information what's now available on MICROC A R D S , where you can get your own material converted to MICROCARD FORM

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