Upon the mains at their exit from the works valves are placed, each valve having a revolving pressure indicator attached, the paper of which is graduated into inches, and tenths, and marked with spaces corresponding to the twenty-four hours of the day. In the meter-house self-regulating governors are used for this purpose. From the gasholders the gas is driven through cast-iron mains or pipes, and from them by wrought iron service pipes to the lamps and burners which help to illuminate our Metropolis. The Company's mains extend about 170 miles, and at any point they supply gas with the same abundance and precision as at Nine Elms. At one time, the Works of the London Gas-Light Company at Vauxhall were considered the most powerful and complete in the world, and even now, in this age of rivalry and sharp competition, under the judicious management of their Board of Directors and their skilled Engineer, Robert Morton, Esq., the London Gas-Light Company maintain an honourable position among other gas-light companies, and are worthy the name they bear. The number of men employed at these works in the Winter season is about 500. There is a Sick Provident Club belonging to the works.[1] [Footnote 1: All workmen employed by the London Gas-light Company (unless hired on other terms) are engaged on weekly hirings, and are required to give, and entitled to receive, a week's notice before leaving or being discharged from the Company's service, except in case of misconduct, for which a workman will be discharged without notice. By order of the Board, A.J. DOVE, Sec. 13_th March_, 1876.] ON A RECENTLY-EXPOSED SECTION AT BATTERSEA. _Extracts from a Paper read before the Geologists' Association, March 1st, 1872, by John A. Coombs, Esq._ "This section was exposed on a piece of ground recently acquired by the London Gas-light Company for a Gas-holder Station. It is situated to the north of the Prince of Wales' Road, Battersea, between the high-level lines of the London, Brighton, and South-Coast, and the London, Chatham, and Dover Railways, near the point of their separation after crossing the Thames near the Chelsea Suspension Bridge. The excavations were commenced at the latter end of last year, for the purpose of constructing two gas-holder tanks, each 185 feet inside diameter. The total length of the excavation, therefore, was about 400 feet, by about 200 feet in width, and 30 feet in depth, the direction of the longest distance being very nearly from N.W. to S.E. The average surface of the ground was 12-ft. 9-in. above the Ordnance Datum Level, or 8 inches above Trinity High Water Mark. The general Section was as follows:-- Alluvial Soil and Vegetable Mould 2 feet Thames Valley Gravel 22 " Altered London Clay (brown) 1 " London Clay (excavated) 5 "