Air photography

ThiO 4-oxoselenazolidines substituted in the 3-position, have been described in a number of patents, (79, 80). They are used as intermediates in the manufacture of pharmaceuttcal products and color sensitizers in photography. They are obtained by action of isothiocyanates on a-hydroselenoacetic acid in the presence of strong base and in the absence of air (Scheme 77). 

An important concern in photofinishing and in industrial photography is the environmental effect of effluents discharged by laboratories that process large quantities of color films. Further concerns are the limited suppHes of clean water available for processing in many areas and the high cost of energy to provide clean air and water at required temperatures. The completely self-contained instant films avoid all of these problems. 

History of upward flame propagation and extinction in lean limit methane/air mixture. Square 5 cm x 5 cm vertical tube. Green color frames indicate PIV flow images. Red color represents direct photography of propagating flame. Extinction starts just after frame c. Framing rate... 

Compounds of silver are used in photography, to coat mirrors, and in dentistry and medicine. Newborn babies eyes are protected from infection by drops of a solution containing a compound of silver, and the same compound is used to treat burns. In pure air, silver would never tarnish. Trace elements in the air cause silver to turn black. Coins like the U.S. 10 cent piece were formerly made of silver, with copper added to make them harder. 

Coatings industries processes, air pollution from, 20 106-109 Coatings industry, 9 153 solid epoxy resins in, 10 359 Coating structures, in photography,... 

Larsh, R. N., P. R. Miller, and. L. Wert. Aerial photography to detect and evaluate air pollution damaged ponderosa pine. J. Air Pollut. Control Assoc. 20 289-292. 1970. 

Soda niter or sodium nitrate (NaNO ) is the most abundant of the nitrate minerals. It is used for fertilizer, explosives, and preservatives. The natural deposits are located in northern Chile, which was the original source for many years. More recently, nitrogen fixation, which extracts nitrogen from air, has been used for producing sodium nitrate. This synthetic process has greatly increased the availability of this useful sodium salt by ehminating the need for the natural source. It is used to preserve and cure meats and is used in photography, in pharmaceuticals, and as a color fixative in fabrics. 

Shock waves were obtd in Perspex blocks drilled thru with different diameters (Fig 1). The shock wave which developed at the top of the block as well as in the ambient air in contact with the bottom of the same was photographed using the high-speed photography equipment of Cranz Schardin, provided with explosive lamps of which the... 

Gun-cotton continues to be an objeot of great interest on account of its application to the beautiful ait of photography. When the cotton is prepared in such a way as to burn slowly, it is not liable to spontaneous ignition, and it is in this state perfectly soluble in ether, which the more explosive cotton is not, If the ethereal solution be poured on the surface of cold wator, a paper is produced, which is prepared for tire use of the photographer. This paper is a very active aleetrio, and is perfectly soluble in ether. Collodion bos also been made use of in surgery, by applying the ethereal solution to a wound, when a thin delicate artificial skin is formed by it, which perfectly excludes the air.—Encyclopedia Britannica. 

One of the major problems in the photography of a volume of air containing droplets is the lack of an adequate depth of focus. Only those particles contained within a shallow depth present true images. It is difficult to make measurements when the majority of droplets are out of focus. La Mer and Lee (SF) have developed a method which places all the drops within a very shallow band. An aerosol stream is forced to pass through an extremely fine slot, so that stream thicknesses of only 0.02 mm. can be formed. 

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