Document G6e9pwVdGmmOZbQ0DYpw1gd9n

NON-STICKING.1 TIGHT CLOSING! -- no pressure build-up DAVIS NO. 13 AUTOMATIC PRESSURE REDUCING VALVES EXCLUSIVE DESIGN-- Single scaled, tight closing, non-sticking. Largo diaphragm, sensitive pressure ad justment. Compact, rugged, self-con tained. TROUBLE-FREE SERVICE-- Built-in strainer, finest quality, all in ternal parts readily accessible and re newable without disturbing piping. Long economical service with minimum time out for repairs or replacement. FOR STEAM, AIR OR GAS-- For initio] pressures to 250 p.a.i.; re duced pressures, 1 to 100 p.t.i. sues from %" to 2". Semi-steel bodies bronte or stainless trim. Economical for use on small units. Write for Bulletin 100-A. DAVIS REGULATOR CO. fttobfitM 1I7S 2S40 SO. WASHTINAW AVI. CHICAGO Q, ILL More TECHNICAL BRIEF cost of frequent "face*iiftin|. lions on blackened buildup! higher in cities having pheric pollution. Also econoatfe' a different type ore tbs rising, mode to individuals or camrriQ| injury to buildings. Thet severe air pollution eis acute effects on the health hu illustrated in several instances, instances include the Mean` disaster in Belgium in 1930 hea thirty people died and hundre made ill; the Donors Incident lober 1948, where twenty per., and 5,910 (42.7% of the papa were reported to have been si! the Posa Rica episode where two persons died and 320 wars had; and the occasional eye, d throat irritation in the Los Aage The chronic effects of common usual air pollution (excluding tb. disease of biological etiology plant origin) on the health o| a persons is a moot question indeed The effect of excessive atmes; pollutants, especially sulfur dinH vegetation is now well recngnltad.' standing examples of vegetation d lion by sulfur dioxide are the surrounding the smellers at Dock Tenn., Anaconda, Mont., Ssh City, Utah, and Trait, Dritish Co' The problem at Ducktown war in the U. S. Supreme Court and tkd Trail, B. C. before an Intents' Joint Boundary Commission sod before sn International Triba which lime damages amounting is 000 were awarded. The effect of atmospheric on animals appears to be of two (1) the direct effect el the poll on the animals, and (2) the i effect on certain animals from contaminated vegitation. Of tbeoc,! latter typo seems lo be of grester] pot-lanes, evidence Indicating a effect being very meager at pi In closing the author stresses well-known facts, namely, that ek P lution control Is a matter of engio^ education and equipment. Of tbesecj cation probably Is of the greatestksj dime importance. If-the people 1"j enlightened country such as this1 given the unvarnished facts, tbsf * recognise (1) that a certain amo08* air pollution is the price that mod paid for those many conveniences * are the product of an industrial P* and (2) that this condition requ^ long lima to correct--it connot be- overnight. ASME Paper No. 5l'*J (lira ordtrlag OtrKtltti s 121 POWER KIRUAtT SEAL ENDS LEAKAGE TROUBLES COMPANY Dept. CV-36) Morten Grew#, 10. pwftt-- UmM; S- A. Arm#r**t W, UK O'COtm, Ttrtttt, Gmm*