Mechanical Contracting & Plumbing January-December 1908 . hetop of the manhole, allowing the pro-ducts of combustion to escape at streetlevel, and the cost, as compared with thelamp arrangement, would be trifling. City Bacteriologist Dr. J. H. Leemingin his report to the Civic Health Com-mittee says: Plates containing cul-ture-media of blood-serum, agar andgelaitine were exposed to the sewer airboth before and after it had passed through the lamp. In the former casethe plates were placed in the pipe lead-ing from the manhole to the lamp. Inthe latter ease the air was conveyedfrom the top of th
Mechanical Contracting & Plumbing January-December 1908 . hetop of the manhole, allowing the pro-ducts of combustion to escape at streetlevel, and the cost, as compared with thelamp arrangement, would be trifling. City Bacteriologist Dr. J. H. Leemingin his report to the Civic Health Com-mittee says: Plates containing cul-ture-media of blood-serum, agar andgelaitine were exposed to the sewer airboth before and after it had passed through the lamp. In the former casethe plates were placed in the pipe lead-ing from the manhole to the lamp. Inthe latter ease the air was conveyedfrom the top of the lamp by means ofpreviously sterilized iron pipe, 12 ft. inlength. Six plates were exposed in botheases, and for a period of II/2 hr. Icalculate that about 2,500 ft. of airpassed over the plates. From the plates exposed to the airafter passing through the lamp, I couldnot obtain a single growth of bacteria,thus proving that the air was the plates exposed to the rawsewer aar, before passing through thelamp, I obtained a growth of 302 Sewer Ventilating Public Gas Light. I should judge as many more germswould be swept on before they had timeto settle on the plates. No one now disputes that sewer aircontains micro-organisms. The unsettledpoint is whether under all conditionssewage will impart to the air its con-tained micro-organisms. It has beenpractically definitely proved that, whenthere is a formation of bubbles in thesewage, the germs, amongst them, ofcourse, are pathogenic ones. It seemsevident to myself that the lamps fulfilladmirably the purposes for which theyare intended, viz., the prevention of allnuisances arising from sewer manholes. The Bank of Montreal have purchasedthe Lyman Rodgers property at Saw-yerville, Que., where they intend short-ly to build a branch. A REST FOR THE EYE. The Canada Metal Co., Toronto, issupplying its customers with a neat lampshade for electric desk or hanginglamps. The frame is made of stiff card-board and the sides ar
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