Show I I A CHUNK CHUNK- OF CITY SMOKE A A Curious Deposit Formed Penned on a a. Cornice Cornice Cornice Cor Cor- nice by London Atmosphere London At London At a recent meeting of the London Smoke Abatement society ty Pro Prof A. A H. H Church showed ved as exhibit No 1 an atmospheric d deposit taken from the cornice below the dome of St. St Pauls Paul's ca cathedral Prof r Church hurch said the ma mass s had d b been n probably y years rs in forming and that similar deposits might b ber be r found in other cities wh where re chimneys chimneys' belched great clouds of smoke into the atmos atmOs- phere The deposit contained he said besides Lone grain grait of carbon per grams grains about half a a. grain gram of tarry matters matters mat mat- In the same weight of deposit But Dut the chief constituent was gypsum gypsum gypsum gyp gyp- sum or crystallized sulphate of lime Ume produced by the action of the sulphuric on the carbonate carbonate carbonate car car- acid of the city atmosphere n bonate of lime lIm of St. St Pauls Paul's stone stone- Boston Globe |