BMaBs reports on: α kind of metallurgical autoradiography . . . mail-order infrared optics . . . a nice fluidized bed The tritium tells
Courtesy o f Aluminum Company o f America, which, in a p a p e r in Nucleonics this A p r i l that describes this technique f o r precipitating tritium to delineate d e f e c t structures in solids, says, "Eastman K o d a k Company 1 χ 3 in. A u t o r a d i o g r a p h i c No-Screen nuclear plates* a r e e m p l o y e d ex clusively," which is a kind a n d p r o b a b l y useful remark to make publicly. It certainly justifies our offering f r e e reprints of their p a p e r on request to Eastman K o d a k C o m p a n y , Special Sensitized Products Division, Rochester 4, Ν . Υ.
Zone-refined aluminum (X6.5). Only the continuous diagonal grain boundary was visible until tritium precipitated where vacancies have condensed . . .
. . . but the tritium sure shows the dis locations piled up at slip bands of an aluminum tensile specimen.
. . . whereas after severe strain and annealing, vacancies migrate out of the cell boundaries and no longer collect tritium . . .
IRTRAN menisci KODAK IRTRAN 2//1 Lenses
for 1-14μ seem to be per meating infrared technol ogy, probably for their ther mal, mechanical, and chem ical ruggedness. There is no chance of getting a poorly annealed one because they simply don't require anneal ing. If you can use any specified here, just send the purchase order to Eastman Kodak Company, Appara tus and Optical Division, Rochester 4, Ν. Υ. We can probably ship in a week. If you need more data or more special lenses, phone 716562-6000, Ext. 5166.
EQUIVALENT FOCAL LENGTH (mm.)
MEASURED BLUR CIRCLE* (mm.)
**
1 . IR-100
25.2 computed at 1.5μ 26.4 computed at 10μ
0.36
$ 77
2. IR-101
25.4 computed at 3μ 26.7 computed at 10μ
0.15
$235
3. IR-301
76.2 computed at 4.26μ 79.5 computed at 10μ
0.38
$395
4. IR-200
50.6 computed at 1.5/* 53.8 computed at 10/x
0.61
$168
5. IR-201
48.8 computed at 4.26/x 50.9 computed at 10/x
0.20
$325
•diameter of axial image of point source at which measured intensity drops to 5 % of center peak intensity, for 2 - 4.5/X range. * * n e t price each in 1-10 quantities, subject to change without notice.
Thermoplastic flour The number of people who know about the fluidized-bed method of coating with plastics is as nothing compared with the number who have never heard of it. If hitherto in the second group, you are hereby switched. To what purpose is for you to determine. TENITE Butyrate 522G looks like flour, except that in addition to white it can come in any hue you choose. Put some in a double-bottomed container. Make the upper bottom a tight-fitting porous plate of sintered glass or metal, or make it solid and minutely perforated. Pump air into the space between the bottoms. If the pore size and the air pressure are right, seething will commence. "Seethe" hardly belongs in the engineering vocab ulary, but it conveys the idea. No dust cloud rises, but the level of the powder does rise. It takes on a ghostly look—a pseudo-liquid, a pseudo-solid, prodi
gious to behold. All objects sink in it. If the object is hot enough (480° - 570°F), the powder particles hitting it melt to form a coating. Unless the object is very thin or for other reasons loses surface temperature quickly, the coating thickens steadily. Have some curves:
The postheating melts the surface layer and polishes it. Dielectric strength of a .020 " coating runs around 16,000 volts. Note that thick coatings can be made, as compared with lacquers. Note that all open ings are entered and all cavity interiors coated. Note where to send for Technical Re port TR-12: Eastman Chemical Products, Inc., Kingsport, Tenu. {Subsidiary of Eastman Kodak Company). Note that though this or ganization equally prides itself as a marketer of organic solvents, it flinches not at bringing this technique to the attention of the techno logical public. This is another advertisement w h e r e Eastman Kodak Company probes at random for mutual interests and occasionally a little revenue from those whose work has something to do with science
