. A treatise on hygiene and public health . Fig. 34.—Manhole, tumbling-bay, and doubleventilating arrangement. SOIL AND WATER. 481 it will retain its efficiency for a long period, od. That the passage pro-vided for the overflow-water from the dirt-box is not dependent upontraps or any other uncertain device needing assistance to maintain it inperfect working order. 4th. The escaping vapors are all brought in con-. FiG. o5.—Lathams charcoal sewer-ventilator. tact with the charcoal, it being impossible for any to escape by the sidesof the tray or in any other way. The charcoal used in this form
. A treatise on hygiene and public health . Fig. 34.—Manhole, tumbling-bay, and doubleventilating arrangement. SOIL AND WATER. 481 it will retain its efficiency for a long period, od. That the passage pro-vided for the overflow-water from the dirt-box is not dependent upontraps or any other uncertain device needing assistance to maintain it inperfect working order. 4th. The escaping vapors are all brought in con-. FiG. o5.—Lathams charcoal sewer-ventilator. tact with the charcoal, it being impossible for any to escape by the sidesof the tray or in any other way. The charcoal used in this form of ventilator is broken to about thesize of filberts. It is advantageous to remove it about once a month, andto prepare it for further use by reburning in iron retorts, atmospheric airbeing excluded during the process. The totalcost of the management of these ventilatorsin Croydon, including reburning, labor, etc.,amounted to one dollar and twenty-five centsper annum for each ventilator. Notwithstanding the advantages claimedby Latham for this kind of ventilator, the ver-dict of the most experienced engineers is nowpronounced against its general use. Charcoalis so often an evil rather than a benefit, that,as a rule, it should be discarded from seweragesystems (Denton). Any device which ob-structs the free circulation of air into and outof the sewer is objectionable. The greatestpossible dilution of the s
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthygiene, bookyear1879
