The examiners came to the conclusion that where there was any liability to an explosion from the presence of carburetted hydrogen, or other causes, the Improved Davy Lamp afforded an almost certain protection.
The attention of the Commissioners seems to have been chiefly given of late, as regards ventilation and indeed general improvement, to the sewers on the Surrey side of the metropolis. Among these a new sewer along Friar-street, running from the Blackfriars to the Southwark-bridge-road, is one of the most noticeable.
Friar-street is one of the smaller off thoroughfares, the character of which is, perhaps, little suspected by those who pass along the open Blackfriars-road. As you turn out of that road to the left hand, advancing from the bridge, almost opposite the Magdalen Hospital, is Friar-street. On its left hand, as you proceed along it, are gas-works, and the factories, or work places, of tradesmen in the soap-boiling, tallow-melting, cat and other gut manufacturing, bone-boiling, and other noisome callings. On the right hand are a series of short and often neatly-built streets, but the majority of them have the look of unmistakable squalor or poverty, though not of the poverty of the industrious. Across Flint-street, Green-street, and other ways, few of them horse thoroughfares, hang, on a fair day, lines of washed clothes to dry. Yellow-looking chemises and petticoats are affixed alongside men’s trowsers and waistcoats; coarse-featured and brazen-looking women, with necks and faces reddened, as if with brick-dust, from exposure to the weather, stand at their doors and beckon to the passers by. Perhaps in no part of the metropolis is there a more marked manifestation of moral obsceneness on the one hand, and physical obsceneness on the other. With the low prostitution of this locality is mixed the low and the bold crime of the metropolis. Some of the off-shoots from Friar-street communicate with places of as nefarious a character. Hackett, whom his newspaper admirers seem to wish to elevate into the fame of a second Jack Sheppard, resided in this quarter. The gang who were last winter repulsed in their burglarious attack on Mr. Holford’s villa in the Regent’s-park favoured the same locality, and were arrested in their old haunts. Public-houses may be seen here and there—houses, perhaps, not greatly discouraged by the police—which are at once the rendezvous and the trap of offenders, for to and from such resorts they can be readily traced. And all over this place of moral degradation extends the stench of offensive manufactures and ill-ventilated sewers. Certainly there is now an improvement, but it is still bad enough.
A Report of the 21st September, 1848, shows that a new sewer, 1500 feet in length, had been “put in along Friar-street, with a fall of 15 inches from the level of the sewer in Blackfriars-road to Suffolk-street. The sewer,” states the Report, “with which it communicates at its upper end in the Blackfriars-road contains nearly 2 feet in depth of soil; it in consequence has silted up to that level with semi-fluid black filth, principally from the factories, of the most poisonous and sickening description, forming an elongated cesspool 1500 feet in length, the filth at its lower end being upwards of 3 feet in depth. Since the building of this sewer, the foul matter so discharged into it has been in a state of decomposition, constantly giving off pestilential and poisonous gases, which have spread into and filled the adjoining sewers; thence they are being drawn into the houses by the house-drains, and into the streets by the street-drains, to such a fearful extent as to infect the whole atmosphere of the neighbourhood, and so to cause the very offensive odour so generally complained of there. Sulphuretted hydrogen is present in these sewers in large quantities, as metals, silver and copper, are attacked and blackened by it; and the smell from it is so sickening as to be almost unbearable.”
On the question of how best to deal with sewers such as the Friar-street, Messrs. John Roe and John Phillips (surveyors) and Mr. Henry Austin (consulting engineer) have agreed in the following opinion:—
“The most simple and convenient method would be by placing large strong fires in shafts directly over the crown of the sewers. The expense of each furnace, with the inclosure around it, will be about 20l. The fires would be fed almost constantly, by which little smoke would be generated. The heat to be produced from these fires would rarefy the air so much as to create rapidly ascending currents in the shafts, and strong draughts through the sewers, the foul air in which would then be drawn to the fires and there consumed; and as it was being destroyed fresh air would be drawn in at all the existing inlets of house and street drains, pushing forward and supplying the place of the foul air.”
Concerning the explosions of, or deaths in, the sewers from the impure gases, there is, I believe, no statistical account. The most remarkable catastrophe of this kind was the death of five persons in a sewer in Pimlico, in October, 1849; of these, three were regular sewer-men, and the others were a policeman and Mr. Wells, a surgeon, who went into the sewer in the hopes of giving assistance. Mr. Phillips, the then chief surveyor of the Commission of Sewers, stated that the cause of these deaths in the sewers was entirely an exceptional case, and the gas which had caused the accident inquired into was not a sewer gas. “There is often,” he said, “a great escape of gas from the mains, which found its way into the sewers. The gas, however, which has done the mischief in the present instance would not explode.”
Dr. Ure’s opinion was, that the deceased men died from asphixia, caused by inhaling sulphuretted hydrogen and carbonic acid gas in mixture with prussic vapour, and that these noxious emanations were derived from the refuse lime of gas-works thrown in with other rubbish to make up the road above the sewer. Other scientific gentlemen attributed the five deaths to the action of sulphuretted hydrogen gas, or, according to Dr. Lyon Playfair, to be chemically correct, hydro-sulphate of ammonia. The coroner (Mr. Bedford), in summing up, said that Mr. Phillips wished it to be supposed that gas lime was the cause of the foul gas; and Dr. Ure said that gas lime had to do with the calamity. But Dr. Miller, Mr. Richard Phillips, Mr. Campbell, and Dr. Playfair, more especially the latter, were perfectly sure that lime had nothing to do with it. The verdict was the following:—“We find that Daniel Pert, Thomas Gee, and John Attwood died from the inhalation of noxious gas generated in a neglected and unventilated sewer in Kenilworth-street. And we find that Henry Wells and John Walsh met their deaths from the same cause, in their laudable endeavours to save the lives of the first three sufferers. The jury unanimously consider the commissioners and officers of the Metropolitan Sewers are much to blame for having neglected to avail themselves of the unusual advantages offered, from the local situation of the Grosvenor-canal, for the purpose of flushing the sewers in this district.”
Of “Flushing” and “Plonging,” and other Modes of Washing the Sewers.
The next step in our inquiry—and that which at present concerns us more than any other—is the mode of removing the solid deposits from the sewers, as well as the condition of the workmen connected with that particular branch of labour. The sewers are the means by which a larger proportion of the wet refuse of the metropolis is removed from our houses, and we have now to consider the means by which the more solid part of this refuse is removed from the sewers themselves. The latter operation is quite as essential to health and cleanliness as the former; for to allow the filth to collect in the channels which are intended to remove it, and there to remain decomposing and vitiating the atmosphere of the metropolis, is manifestly as bad as not to remove it at all; and since the more solid portions of the sewage will collect and form hard deposits at the bottom of each duct, it becomes necessary that some means should be devised for the periodical purgation of the sewers themselves.