However, it has been found that copper chloride, lead chloride, tin chloride, ' zinc chloride, common salt and some other salts are partially effective in removing soot from furnaces and boilers when properly used.8 CONDENSATION AND CORROSION Sulfur dioxide or sulfur trioxide formed by the combustion of sulfur in fuels, is the principal corroding element in flue gases, and becomes active whenever moisture is present for the formation of sulfurous or sulfuric acid.8 It is necessary, therefore, to maintain a flue gas temperature in excess of the dew-point temperature of the flue gases in all parts of appliances, unless they are made of materials that will resist these cor rosive influences.

Lead......................................

Lead.................................

Provision must be made to prevent water from freezing in the tank, the tank vent, and the pipe leading to the tank.

I1 can also cause annoying whistling at door openings and lead to serious complaints in hotels and offices.

HEATING & AIR CONDITIONING CON TRACTOR (formerly Sheet Metal Worker) is the leading magazine in the warm air heating, packaged air conditioning, ventilation, and sheet metal contract* ing industry.

Screen strainers are frequently installed in the liquid line piping before solenoid valves and expansion valves, as well as before regulating valves in water lines leading to water cooled condensers.

The reference literature contains Tower Performance Factors which have been reported by various investigators, but the reader should be warned that the use of such factors, without a full understanding of the source, may lead to erroneous results.

The inadequate blood supply and oxygen deficiency may lead to tissue death or gangrene.

Decreased readings in several branches and near normal readings would result if the header was partially plugged in branches nearer the dust collector when the header leading to the collector becomes plugged.

. * TGHbldSeanceWithRa\RtoSeVett.lgeneta^y regattjed.as oriie of-tlie leading hopc^iils^offthe' HOUSE PAINT Democratic -party- ife the rape<tr the nomination for [governor.<?

Certainly a pulmonary function test and chest x-rays pLace specific roles in dusty environments and blood lead results where required are quite useful.

Them is an abundance of oils such ss linmH sad soya, but pigments, including lead, sine, titanium aad certain colors, am in shorter supply.

., National Lead Company Bay Refining Corporation Bell Brothers Bell Oil & Gas Company Belridge Oil Company Bentex Oil Corporation Berry Asphalt Co. of Arkansas Berry Refining Company Bethlehem Supply Company Big Chief Drilling Company Bishop Oil Company Blanco Oil Company Bond Oil Corporation Bovaird Supply Company, The Bradford Motor Works- Bradley Producing Corporation, The Braun & Co., C.F.

Papageorg In summary, our observations, admittedly limited, both from our laboratory data and from report* of other investigators, lead ua to believe with considerable confidence that PCBe do degrade in the environment.