VOLUME
2 1 , N O . 8, A U G U S T
13 A
1949
electron
How the RCA mic**500**
helps American Cyanamid
develop synthetic resins to make wet paper stronger You CAN CARRY y o u r g r o c e r i e s h o m e in a p a p e r b a g w h e n t h e b a g i s d r y . B u t c a n y o u d o it w h e n t h e b a g is w e t ? Y o u c a n — i f t h e p a p e r fibers a r e t r e a t e d w i t h s y n thetic resin w h e n t h e p a p e r p u l p is p r e p a r e d . T o study t h e p h y s i c a l p r o p e r t i e s of p a p e r fibers treated with synthetic resins, American Cyanamid R e s e a r c h l o o k s d e e p i n t o t h e s t r u c t u r e of p a p e r fibers—with an R C A Electron M i c r o s c o p e . T h i s in s t r u m e n t aids i n revealing t h e m e c h a n i s m by w h i c h r e s i n s m a k e w e t p a p e r s t r o n g e r . B e c a u s e the Electron Microscope can resolve and magnify 20 to 50 times greater than is possible with light microscopes, and the depth of field is 75 to 150 times greater. T h i s s u p e r i o r i t y of t h e E l e c t r o n M i c r o s c o p e a l s o is a n i m p o r t a n t factor in A m e r i c a n C y a n a m i d ' s de v e l o p m e n t of resin-treated textiles—fabrics that are waterproof, shrinkproof, and wrinkleproof! R C A w i l l b e g l a d t o h e l p evaluate t h e usefulness of t h e E l e c t r o n M i c r o s c o p e i n t e r m s of y o u r o w n a p p l i cations. For information, simply write Dept. 4 8 H .
Dr. Frederick G. Rowe slides a p h o t o g r a p h i c plate into the built-in camera of the RCA Electron Microscope. By this means, perma nent r e c o r d s are made of specimens. A'· Untreated Alpha Pulp — Magnification, 18,000 X.
SCIENTIFIC
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