One turn of the four wheels makes 114 strokes; and when the river is at best, the wheels go six times round in a minute, and but four and a half at middle water; so that the number of strokes in a minute are 684; and as the stroke is two feet and a half in a seven inch bore, which raises three ale gallons, they raise 2052 gallons in a minute; that is, 123,120 gallons, or 1954 hogsheads in an hour, which is at the rate of 46,896 hogsheads _per_ day, to the height of 120 feet, including the waste, which may be settled at a fifth part of the whole. _Desaguliers Mathematics._ LONDON BRIDGE _yard_, Tooley street. LONDON _court_, 1. London street. 2. Rosemary lane. LONDON HOUSE, on the west side of Aldersgate street, was anciently called Dorchester House, and afterwards Petre’s House, from its having been possessed by the Marquis of Dorchester, and afterwards by the Lord Petre: but after the restoration being purchased for the residence of the Bishop of London, it obtained the name of London House. It is a large commodious brick building, with a neat chapel belonging to it; but being deserted by the Prelates of this see, is now let out into several tenements and warehouses. LONDON HOUSE _yard_, 1. Aldersgate street. 2. St. Paul’s church yard. LONDON INFIRMARY, on the south side of Whitechapel, is one of the many foundations that distinguish our country and the present age. It is supported by charitable and voluntary contributions, for the relief of all sick and diseased persons; and, in particular, manufacturers, seamen in the merchants service, and their wives and children. This charity was instituted on the 2d of November 1740, in a large house in Prescot street, Goodman’s Fields, which is now the Magdalen hospital; but that becoming too small for this extensive charity, a new, more capacious, and more commodious building was erected by the voluntary contributions of several Governors, in an airy situation, near the Mount in Whitechapel road. This is a very neat brick building, contrived to be plain and yet elegant, without being very expensive; and it consisting of one extended front, without either wings or inner courts, the whole is seen at one view. To the middle door is an ascent by a flight of steps, and over this part extends a very large angular pediment, within which is a dial. Above the ground floor extend two series, of each twenty-three sash windows, their number and the length of the building giving it an air of dignity. The architect has properly considered the use for which it is designed, and has suited every thing to convenience. It is properly furnished, and fitted up with about 160 beds for the reception of the patients.