SCIENTIFIC TESTS OF WEBB SEWER LAMPS
LABORATORY AND ASSAY OFFICE,
37 PARADISE STREET,
I hereby Certify that I have examined the Sewer Gas Destructor, erected by you at Hockley, where every facility was afforded me for testing the apparatus, and I have to Report as follows :—
1. The apparatus is full-
2. It is a combination of a Street Lamp and an Extractor, in which the lighting and destructing power of the gas are both utilized.
3. The rate of extraction of sewer gas when the burner is passing 15 cubic feet per hour averages 580 cubic feet per hour, and this quantity is drawn over a length of some 450 yards of sewer.
4. The nauseous character of the sewer gas entering the Destructor is most marked. The whole of this gas is subjected to a temperature of 650-
5. At the temperature obtained I regard the existence of any disease germs or nauseous organic bodies in the gases leaving the apparatus as impossible
6. I made careful photometric measurement of the effect of the sewer gas on the luminosity of the flame, and I found in every experiment a distinct increase when the sewer gas was being consumed. The actual increase varied considerably in accordance with the condition of the sewer and the prevailing wind, etc., but I should consider the increase was at least 5 percent above the normal, that was when the gas was burning in ordinary air.
From these results, I conclude that the system is one of very considerable importance, its efficiency is certainly very high and its utility would appear to be of very wide application.
ALEX. E. TUCKER, F.I.C., (Consulting Chemist)
NOTE.—The Destructor which Mr. A. E. Tucker experimented with was fixed to a 6 in. drain, laid to the building line and connected to the main sewer, ll ft. 6in. deep, by the Corporation of Birmingham, and the whole of the other parts under their supervision and tested by them. The length of drain from Destructor to main sewer is 130ft., and the gradient is only ¼ in. per foot. The height of Destructor outlet is 12 ft. above the level of the street, and it is therefore working under disadvantages which would never occur in ordinary street lighting, where it would be placed near the sewer and the drain leading to it, only shorter and of a much steeper gradient, thus adding to the results it has already obtained.
SINCE the testing of our system for the extraction and destruction of Sewer Gas by Mr. A. E. TUCKER, as recorded above, we have, as the result of careful study of details and of experiment, made considerable improvements, and being determined to subject our Destructor to the severest practical tests possible or obtainable, we approached the Tottenham Local Board, whose sewers, we were informed in some places, were most foul with sewer gas. The Board accepted our offer to erect two Destructors, and the Sanitary Committee of the Board with its Engineer carefully selected two sites, where, judging from the reports of their own Officials, given in consequence of Memorials against the prevalence of foul smells in the roads made by residents in the immediate vicinity, they knew the sewer gas exhalations to be highly noxious and dangerous. These two sites were undoubtedly the worst in Tottenham.
THE ST. ANN’S ROAD DESTRUCTOR.— This was, on July 19th 1894, fixed on a “Refuge” taking the place of a Sugg’s 3-
THE LORDSHIP LANE DESTRUCTOR.— The Site of this Destructor, which was fixed on July 25 1894, is on the rise of a hill. The sewer operated upon is the Main Sewer leading from Wood Green to the Pumping Station, where the Tottenham Sewage is lifted into the Metropolitan Main Drain. The sewer at this point is over 30 feet below the road surface and is 3 feet by 2 feet inches. Here, as at St. Ann’s Road, all known air inlets were closed and the connections made by the Boards men. This Destructor deals with a sewer in which Sulphuretted Hydrogen largely prevails, and its effectivity is most abundantly proved by the thick deposit of the waste products of combustion on the pneumatic radiator of the Destructor, and also by the absence of the sickly smell which on previous occasions at this spot has caused people to faint in the roadway. The light of the Destructor is very brilliant, and the hot air emitted is quite free from smell or taint.
On July 30th 1894, the District Surveyor, on behalf of the Local Board, commenced his official tests of the two Destructors, and though not yet completed, his advance statement to his Board, as subjoined, sufficiently indicates that our System as applied at Tottenham is a practical success. We claim that the coal gas now used for ordinary street lighting can without any increased consumption be utilized also at the same time to effectually extract and cremate all gas generated in the sewers ; a small Destructor burning 6 cubic feet per hour of coal gas, being capable of keeping up a temperature of at least 240 Fahrenheit, a heat sufficient to destroy all germs of disease in a length of sewer 900 feet linear by 15 inches diameter.
EXTRACT FROM A TOTTENHAM LOCAL PAPER OF FRIDAY AUGUST 3RD 1894
“TQTTENHAM LOCAL BOARD.— A meeting of this Board took place on Wednesday evening last at Coombes Croft House, Mr. E. P. Huggett in the chair. The members present were :St. Ann's: B. Goodwin, J. Messum. High Cross: F. Jenkins, W. E. Barrett, R. H. Matthews. West Green: W. Jubb. P. B. Malone. Middle Ward : A. Campion, W. Peart, C. W. Bradshaw. Lower: J. Cloudsley, W. Brown. Absent: A. A. Robinson and W. Low.
SEWER GAS DESTRUCTORS.
Mr. Bradshaw asked the Engineer if he had tested the sewer gas destructors that had been erected. The Engineer said he had made one test of each destructor the previous day and that day, and the average temperature was 550, while the average extraction of sewer gas was about 1,300 cubic feet per hour. Mr. Messum said that, previous to the Destructor being erected in St. Ann's, those in the immediate neighbourhood could hardly stay in their houses as the stench was so abominable, but since it had been erected they had had no smell whatever, and more than this, on Tuesday the manhole of the main sewer was opened, and he knelt down and put his head over it, and it was perfectly free from smell. The Engineer further stated that he was going to continue the tests under all conditions of the atmosphere, and when he had concluded those tests he would submit his report to the Board.”
Note: These two have been purchased by the Tottenham Council after nine months trial.