., Eagle Picher Lead Co., Research Lab., Joplin, Mo.

Underdrains leading to points of free discharge are placed in the gravel or crushed rock beds.

There seems to exist a general opinion, supported by some experimental and statistical data, that warm, dry air is less pleasant than air of a andVMi&S'l Ctetolier,TI932LratUre ShU`d DePend UPn Type f ""paIICy- b* J-* Walker {Heating 68 - --mi 3 physical & Physiological Principles or Air Conditioning Chapter moderate humidity, and that it dries up the mucous membranes in such a way as to increase susceptibility to colds and other respiratory dis orders ** 38' Owing to the cooling effect of evaporation, higher tem peratures are necessary, and this condition may lead to discomfort and lassitude.

The lacqu er * most commonly used are a glossy black enamel - #32 of the Egyptian Lacquer Company o f New York Cit y , a black laoquer which gives a leat h er lik e crackle su r face - the produot of the Zapon Brevolite Division of the Atlas Powder Company with the tr ade name of Black Bretrokrak* (I b elieve t h is produot i s made by one of your su b sid iar ie s and you may be en t ir ely fam iliar with i t , ) In ad d ition a white lead-con tain in g laoquer togeth er with an ivory one i s v.aed r ar e ly .

Average Lead Used per Gallon.......................*>..9.$/..SS-!

It is impossible to install a water gage glass on an inverted bucket trap, but if visual inspection is necessary, a gage glass can be placed on the line leading to the trap.

International Lead Zinc Research Org.

This is particularly important if toxic metals are known to be present (e.g. nickel, chromium, lead, etc. 1.

Owing to the cooling effect of evaporation, higher tempera tures are necessary, and this condition leads to discomfort and lassitude.

Continue to follow OSHA regulations pertaining to asbestos, the burning of lead primed steel and the disposal of contaminated clothing.

CONVEYOR PIPES The conveyor pipes leading from the hoods to the fan and thence to the collector are commonly made of galvanized iron, the gage of which varies from No. 24 to 14, depending upon the diameter.

Ohio St.f Chicago, 111..... ....................... . 1000-1001 E Eagle-Picher Lead Company, The, Temple Bar Bldg., Cincinnati, Ohio................. 1021 Econ-O-Col Stoker Div., Cotta Transmission Corp., 2342 Eleventh St.; Rockford, I1L.............................................. ......................................................... 1107 Ehret Magnesia Manufacturing Co., Valley Forge, Pa...... ......................:...... 1022-1023 Excelsior Steel Furnace Co., The, 118 S.

To manufacturers whose products are used in residential air conditioning, AMERICAN ARTISAN offers full cover age of the leading buying factors.

These are available at small not only among the most progressive merchants in these industries, but among the industry's leading combustion and heating engineers.

The-use of the bypass around-the heating coils permits the mixture of hot and cold air in any desired proportions, by the use of a mixing damper at the point where the two ducts from the heater, and from the bypass, join to form one duct leading to the room.