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PRECISELY os y o u w a n t i t •
to control your product's quality
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to prevent condensation on your product or material
^- to prevent changes due to moist air in contact with your product •
to protect your material from dampness
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to protect your processing of moisture-sensitive material
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to DRY your material or product
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to pack or store your product safe from moisture damage
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to get exact moisture control for the precise atmosphere condition you need
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to provide precise atmospheric conditions for testing
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to increase your air conditioning capacity
The Niagara's Controlled Humidity Method using HYGROL moisture-absorbent liquid is The cleanest because . . . no solids, salts or solutions of solids are used and there are no corrosive or reactive substances.
Most reliable because . . . the absorbent is continuously reconcentrated automatically. No moisture-sensitive instruments are required to control your conditions. Most flexible because . . . you can obtain any condition at will and hold it as long as you wish in either continuous production, testing or storage. Easiest to t a k e care of because . . . the
apparatus is simple, parts are accessible, controls are trustworthy. Most compact, t a k i n g less space for i n stallation. Inexpensive to o p e r a t e because . . . no
re-heat is needed to obtain the relative humidity you wish in normal temperature ranges and frequently no refrigeration is used to remove moisture. Write for full information;
N i a g a r a Controlled Humidity Air Conditioning This method removes moisture from air by contact with a liquid in a small spray chamber. The liquid spray contact temperature and the absorbent concentration, factors that are easily and positively con trolled, determine exactly the amount of moisture remaining in the leaving air. Heating or cooling is done as a separate function.
ask for Bulletins
112 and 121. Address
Dept.EC-S
N I A G A R A BLOWER C O M P A N Y 4 0 5 Lexington Ave., New York 17, IM. Y. District Engineers in Principal Cities of (J. S. and Canada For further information, circle number 26 A on Readers' Service Card, page 115 A 26 A
INDUSTRIAL A N D ENGINEERING CHEMISTRY
by their radioactive effect on multilayer color film. At the University of Florida, photography has been used to study the burning properties of flames. At Pennsylvania State University, a c a m e r a in combination with a field ion emission microscope has permitted pictures to be taken for the first time of single atoms of tungsten. Pictures That Move
^ to DRY large quantities of fresh air from outdoors
Best and most effective because . . . it removes moisture as a separate function from cooling or heating and so gives a precise result constantly and always. Niagara machines using liquid contact means of drying air have given over 20 years of service.
REPORTS
In the laboratory, widespread use is also being m a d e of motion pictures. I n studies of boiling, movies have been taken at speeds as high as 20,000 frames per second, although speeds of 2000 to 4000 frames a second are usually a d e q u a t e . W h e n slowed down to about 16 frames a second, these films can be extremely useful in the analysis of all phases of the boiling process. At Esso Research a n d Engineering, high-speed movies have recorded w h a t happens to a n a u t o mobile tire when subjected to sudden shock. At Dow Chemical, motion pictures have helped determine w h a t goes on inside the walls of a plastics injection molding machine. These movies have turned u p valuable information on the flow of plastic material in the mold, as well as on the packing, discharge, a n d sealing of the mold. I n the past, m u c h of this information has been based merely on theory a n d guesswork. A motion picture c a m e r a at Wright Air Development Center has provided round-the-clock readings of dials a n d gages in the creepr u p t u r e testing of metals. At regular intervals, the lights go on, the shutter is clicked, a n d the film is advanced to the next setting. T h i s conveniently eliminates the need for engineers to stay u p all night to take readings. I n a somewhat similar use, O h i o Power Co. has relied on photographs to obtain readings simultaneously on a large n u m b e r of rapidly fluctuating meters—a j o b that might be extremely difficult by any other means. Inside chemical plants, the c a m e r a is also being used in dozens of other ways. As one example, photographs are helping to replace or supplem e n t engineering drawings. At General Aniline and Film a n d other companies, photographs are par-
