Kodak reports fo laboratories on: n e w s for those w h o dye . . . r e v i e w i n g flames, fractures a n d explosions 5 9 years o f radiographic tricks
Please be preconditioned Because these reports are written for readers with a scientific turn of mind, we should like to discuss in some detail the chemistry of the new Eastofix Dyes which we have just announced to the textile indus try as a solution for the hitherto in soluble problem of piece-dyeing ace tate fabrics to a wash-fastness, lightfastness, and gas-fastness equal or superior to that attained in other wise less favored fabrics. But we can't just now; commercial consid erations impede diffusion of knowl edge for its own sweet sake. We must content ourselves to regard you as a consumer and technical thought-leader for other consumers. Soon, in those capacities, you will b e confronted with washable ap parel and home furnishings pro claimed as being of Estrel fabric. Lni
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Eastofix Dyes
our acetate fibre and are its sole or dominant compo nents. The implication is that in respect to color and press reten tion, shrinkage control, comfortable moisture balance, luxurious texture, wrinkle and soil resistance, ease of washing clean, and rapid drying after laundering, the combination is a good one. If, perchance, you are in the trade and wonder what's in it for you, go ask Eastman Chemical Products, Inc., Kingsport, Tenn. (Subsidiary of Eastman Kodak Company).
Slicing time I f you would like to live over and over again a certain % second sliced into 2,000 1.2-jusec slices, we have just the ticket for you. The Kodak High Speed Camera, w e admit with no shame at all, is not highbrow instrumentation.* It is a 16mm movie camera designed for and widely used by practical men with practical manufacturing problems to solve and impatient production chiefs to keep happy. Its controls are relatively few and unimpressive. Aside from a few photoflood lamps and maybe a stand, there is little auxiliary equip•Nevertheless, we venerate highbrows, particu larly for what they do with our film.
ment for the assistant photographic engineer to tote. With such an unsophisticated ap proach, you get an exposure time for each frame that is always *,& the repetition rate. Since the camera speed range is 1000 to 3200 frames per second, this means that the time available for smearing out the image is 63 t o 200 Msec. The dis tance moved by a machine part in this time, divided by the image-toobject size ratio, is rarely large enough for blurring. Flames, fractures, and explosions are another matter. Here we do use extra equipment to illuminate the subject by repetitive flashes from a discharge lamg with enough output even for schlieren photography with the camera. A reluctance pickup gives a synchronizing pulse at the instant when each frame is in posi tion. And that's how we get 1.2μζεο shavings from big, fat 63 to 200-^sec slices. The distinguished high speed photo graphic pioneers, Edgerton, Germeshausen & G tier, Inc., 160 Brook line Avenue, Boston 15, Mass., make this stroboscopic auxiliary equipment for the Kodak High Speed Camera. // is to them we suggest inquiries on this matter be di rected. For a booklet on the camera it self, write Eastman Kodak Company, Graphic Reproduction Division, Roch ester 4, Ν. Υ.
The soft x-ray With so many professional opin ions o n periodontoses, pelves, po rosities, and the like being reached from observations on our x-ray film, we find ourselves with the resources to do little things for our friends, who are legion. F o r example, a bibliography on soft x-ray microscopy, microradiog raphy, electron radiography, and geometric x-ray microscopy, t It lists every paper and article on those subjects known to us, except that unlike our bibliographies of vitamin E s this is not annotated. The ar rangement is alphabetical by au thors, whether they be of the indus trial, medical, metallurgical, botani cal, zoological, entomological, or fine arts persuasions or just plain physicists,
The earliest reference was pub lished April 13, 1896, in Comptes rendus hebdomadaires des séances de Γ Académie des sciences by F . Ranwez under the title, "Application de la photographie par les rayons Rôntgen aux recherches analytiques des matières végétales." The most recent is dated August, 1955, and deals with electron radiography in the investigation of postage stamps. Among the 350-odd items that lie between these two, you wiii find "Ueber W e i c h s t r a h l a u f n a h m e n mit d e r OJeichspannungsmaschine 'Trifas' der Elektrizitatsgesellschaft 'Sanitas' " (H. Chantraine, JOrtschritte aufdem Gebiete der Kontgenstrahlen vereinigt mit Rontgenpraxis, 38:534541, September, 1928) and "Μιικροp e H T r e H o r p a t i m n " ( C . B . Tpe^iHiiiKHH, BecTHUK peHTzenojiozuu u panuojio-
zuu,20: 397-408, 1938). S€ndif!
