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.

Heating Unit, Electric: A structure containing one or more heating elements, electrical terminals or leads, electric insulation, and a frame or casing, all assembled together in one unit.

Soot can probably be most effectively removed by a jet of compressed air, by means of a brush, or a vacuum cleanerHowever, it has been found that copper chloride, lead chloride, tin chloriqei zinc chloride, common salt and some other salts are partially effective w Fuels and Combustion 377 Table 10.

Under direclloo of Bi normally controlled from a remote units similar to the recently described tuminous Coal Research, the project experimental machine (Power, Jan has the support of 70 of the nation's point through a supervisory selector system. 1947, pp 98102; March 1948, pp 80- leading coal producers, coal-land com 71 (403) POWER July %pi CIRCUIT PROTECTION By J J O'CONNOR, Aeilfttrn Editor Every engineer reoognizea that protective equipment is necessary to guard circuits ond machines against abnormal conditions.

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

The material presented leads to an illustrative procedure for a cooling-load calculation, and a numerical example is given to demonstrate the calculations involved.

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

ANACONDA Vibration Eliminators are stocked by Leading Wholesalers ANACONDA METAL HOSE DIVISION ANACONDA AMERICAN BRASS COMPANY i?.

Andreis fed on iin-conv>':ring food nay tend to nccunulat0 a body lead.

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

Supply Mains: The pipes through which the heating medium Sows from the boiler or source of supply to the run-outs and risers leading to the heating units.

'As average-aftercoolers reduce lea*'J hing-me, outdoor water-soften- ing air temperature to within 12 lo 1^ ^-,i*itgusigyssytsetemm wwaass rreecteennutlyy iinhsitaaullecduubyy F of entering water temperature, [Alli^Chslmers to meet the special Ing shown above can be accomplUbedj Voeeds of a leading midwest oil refinery, with water ai 55-56 F.

Qf NATIONAL LEAD COMPANY h e l d a t III Br o a d w a y , Ne w Yo r k Cit y , Tu e s d a y , Ma y 24, 1955, a t 11:15 o 'c l o c k A.

/ Supply Mains: The pipes through which the heating medium flows from the boiler or source of supply to the run-outs and risers leading to the heating units.

uiyalcnt length of the various fittings cannot now be determined since the known263 f the building main, riser, and branch leading to the highest fixture are not selpM?