ad liquefied ozone. NOVEL WINDOW SCREEN. loss, and the butter produced will be of a uniform quality. These chemists have been able to ozonize oxygen to a greater The engraving shows an extensible window screen that Besides the features already described the dasher has a extent than has hitherto… … than that of more complex structure. Under special physi- and usefulness that will be understood and appreciated by is little if any more expensive than screens of the ordinary cal conditions it seems possible that new allotropic modifi- those familiar with the subject. kind. It is as strong when…
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