Show SMOKE CHARTS WILL AID CITY 1 Density of Vapors at Each Plant Is ls Being Found Much i Data Gained Further r reasons for the h murky at atmosphere at- at of or Salt Lake Lale primarily tho the product by-product of oC coal improperly combusted combust combust- ed ell and nourished through h the channels of smokestacks anti anil chimneys each cacti cloud of oC smoke created containing vat val heat liea hean and n power CI units arc being leing carefully Investigated by 11 the tripartite staff ot or the bureau au of oC mines University er sit of ot Utah and Salt Lake sity City ac according according aC- aC cording to lo Thomas A. A superintendent of or the bur cans can's branch here At present smoke c production of or Salt Lake plants I Is heln being charted b by the JUn method Field men make mako he fhe o observations and specify the smoke densities of each c-achi plant at various lS limes lines In the Jay day to strike an au cra a average c. c ll By the process smoke densities are arc listed In five classes Xo No 1 1 20 W per percent percent cent No Xo 2 40 pet per cent No Xo P. P i. i GO 60 per percent percent cent No I. 4 4 SO per cent and No o. o 3 ii ncr percent cent Go CI Ier Cent Ac According o lIng lIng- to Mr r. r Varley CO GO per cent centIs Is the density prohibited b by the lie average average aver aver- age smoke ordinances of ot American cities The or ordinary definition of oC this I. I hn i. i fo I I.- I. I I v 10 0 milk u Ik J 10 0 fiU U uie LIIL uit Il cannot can can- not be bc seen through Smoke of or densities densities densi densi- ties lies 1 I l' l and 2 2 not being so BO thick as to shut 0 off all ill li light ht arc generally allowed b by the smoke ordinances Observations b by the lie chart method require the thc reading of or smoke density of or a stack fifteen Iteen er e every seconds seconds sec see throughout the time o of a lion tion The figures obtained aro arc reduced to smoke units each of which Is equivalent equivalent equi a lent to one minute of or No o. o 1 smoke moke Io Low Scores Obtained In territories where smoke abatement abatement abate abate- ment mont work orl Is well established high pressure power plants arc are expected lorun to lo torun torun run inside 5 6 per cent smoke density The he average e In unrestricted territories Is from 5 per cent to 60 per cent densi t ty 3 Heating plants even cn show how a a. density densi densi- t ty of from froni l 15 to toto 40 to per cent cent but It Is possible to cut cul tho time density of or such plants down own to lo 2 and nd 3 per cent This Is done dorte In man many plants When hen one has learned the tho average smoke c density of or orall all plants In a certain er- er tain taimi class and the tho coal consumption of or this class It t la is simply a matter of oC re reducing reducing re- re the tho amount of smoke made to a percentage of the thc total produced in tho the city This brings the tho proposition down downto to a mathematical basis and eliminates the guessing which has so frequently characterized tho the smoke situation In Inmany Inmany inmany many places Much data daU relating to smoke production production production tion of or local plants has been accumulated accumulated already alread nail and within a short time this phase of oC the Investigation will have been completed The work of tabulation and deduction will follow Subsequently all plants In the city will be assisted In curtailing smoke |