New Britain herald., 1930-11-17
HEAVY SMOKE PAIL
 CUTS DOWN LIGH7
Study Made in Manhattan Shows
 Injury to Health

New York. Nov. IA report re- gently issued by the United States Public Health Service describes in an interesting manner a study Of the less of light due 10 smoke on Man haitian Island. New York city, dur ing the year tg21 especially in its relation to the na-4re Of ,aa "7a.h- CT. the relative humidity Of Tho air and he velocity and d5r--'on Q. the wind
 The contamination o5 'ae a'a.os- pnere by smoke from raa cnlur1=s Of private hogses office buildings industrial plants. steam engines tugs, and steamships has aec0n." a serious matte" j1 several z. the larger cities Of the 1ncal S.a."s The presence .0 tho a.- o+ #~-" numbers Of particles O. 500 md ash. ari Of 2urrae.at-a aa.a.0.s o5 s-Iph4ric acid and other rmr-~.Has results In injury 70 tTs.~ and plants and in eco-om.c loss. and is 4 a..r.- mert 10 hea.tu.
 Since the iulurs 10 hasua is due. in part, to the loss Of 5aE.-a'. ana since the loss of daylight is meas Ire Of t1e ~m0kigess o[ the at- mosphere. it srcns desirable 10 dc- termIrc. as ta. aS rQSsg aLr. t.e sN- act amount Of n-ac which .s lost g,t -.. different seasons Of fh0 y1ar a~i at different hours Of rhe Jas- and also the extent to which tho loss Of u2ht IS affected hv tho a.-t- srape, and danslry of The smoke .aE- ar. ths humidity Of the ar. f.. N'- ,ocErv and direction Of tle wind a~3 by o-rar ra-togs
 Comparative study Made
 < favorable orD9~"u.-E tor s#ea a study offered us~.s ill N.w York city during the var 1@--. -.a~n simultaneous records O. aa,ucnt could he c0n}antantlE made CT taa rcof oe t1c rur-l States Marine Hospital at f- Hudson street.. at The lower end Of Naah@-an Island. re N..'- .lt.. and on the roor Of q building a- taa United States Quarantine station on Hoffman Island in lower Nsw Nor., Bay, about miles south Of he hos pitaL where 'ho ar WAS para lively clear. Tho instruments us,d were ot tho type which have been IT. use in Was1ja-tc2. D. E.. ur th2 United States Public Health Service cor racordIng daylight since Jnir 1t24. They con=ls-eI os phofoelaC,r.o cells and racOr1snE potarr!ometers.
 The pho-oel7ctric cell was placed or the roof Of the buiid.ug where the study was -o 5e made and tho recording pote1-ionatsr v7s placed n 8 convenient position within tAc building, Tho platform was o* such height ta@- no shadows wore la-t upon tho cr,. a- z1E season Of ru" year. and 7as also 50 co1s'f.nr,d that -hs cell was accessible. so that .t- glass surface could Ue kept clcan. The cell at Hudson street vas about -J tear above inc street level and 3 feet aova moan high wa- tar. Tho cell on Hoffman Island vas aao.- 25 ter- a9oEe ta. ground and A <sa- aaora H-l water.
 smoke Ie-~en, Light
 C0mrar.s0r O. -aa results oata5u- eG at inc tao places showed tht there vas a largo relative loss Of light at inc Hntson str.st hospital due to suoE-. In soma oas.+ The av- craze hourly or daily loss was great ec than 56 ger csa- The ..,raE, percentage loss for rna whole var was 16.F for casar days. @t.f 10" cloudy da,s. and = , for a.I days The results Shou.d rha- ra@ loss Of light depends. among otasr tu.nr=. the ra:rra Of tle I4"l-ut. wh.thar from rlear OF a nudity or -1a a.r. and upon t1e velocity or -r. -.tI
 The e@.5ct Of tue altitude Of the sgn upon tha percentage loss Of light v.os shown clearly in tle sar.- at.on Of tho perrartog" loss with tuo hour O. tHa Ian. Tlo arsug" 1ercantage loss Throughout tue year was ca.2 at S:&r a. m.. 1c.5 ac f:a" ?. m. and -I.1 at @-"p p. lr Tha averaro monthly pcracura-" I0.s"y c lish- showed no marked seasonal effect hgt did show a marked yalt- ton 10 the average month. r.Ia'lrr hImidi-ies. tar raGe.Gtl-. lo.z.s usually increasing and a"~r-a~lu@ with the relative humiGHieH. For clear days the greatest average monthly percentage loss was 23.1 n November and the least 12.l in Nav with corresponding average rela- tive humidIties Of G4,f and &9.o per cent. For cloudy days those values were 52T in September and 24G in December, with Spouding ag- craze relative humtIitio- of 9a4 and 65.9 per cent.
 Most Lost on Clear Days
 Other conditions being 'ue same. the average percentage loss Of light was greater for cloudy days. or cloudy hours, than for rl-ar days or clear hours; tho percentage loss he ing about 1.5 15mrs as great for cloudy days as for clear dass for re latiye humidities between 4u and Su per cent and for wind yelocitjos be tween 100 and t99 nil0a per hour For the same kind Of shy clear or cloudy, tho average percentage loss Of light increased with increase Of relative humidity. For 2 clear sk, the average percentage loss was twice as great for a relative humid ity of g. per cent as for &5 per cent. For a cloudy sky tho incroase with relative humidity was not as great The percentage loss of light was also found 10 decrease as th" velocity Of the wind increased.
 ROotIpgpey Threatens