Examining X-ray plates by mercury-vapor lamps

• Publisher: Elsevier Science
• Year: 1915
• Tongue: English
• Weight: 66 KB
• Volume: 180
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(15)90283-1

✦ Synopsis

I26

CURRENT TOPICS.

[J. F. I.

world. Fresh air simply pours into it in extravagant volumes. In a moderately full house there are no less than 13,ooo cubic feet of air supplied per head per hour. Yet it produces, without any possible doubt, the effects which we are accustomed to think of as associated with defective ventilation--lassitude, sleepiness, infection, and so forth. Complaints are loud and quite general. A room may, on the contrary, feel fresh and sweet in which, judged by chemical standards, the air is very bad. The author has analyzed air containing 25 volumes per io,ooo of CO 2 which felt as fresh as a spring morning, although IO volumes is regarded as the extreme allowable impurity in current science. There must be some combination of chemical or physical conditions which accounts for the effect, so far as it is objective; when it is purely subjective, of course, it is impossible to analyze the effect. Nobody up to the present has ventured to specify what is that combination.