London, unlike Edinburgh, has a vast water-side property, always exposed to danger from fire. Almost immediately, therefore, after having taken the command of the London Brigade, Mr. Braidwood directed his attention to the construction of improved floating fire-engines, to be moored in the river, where they would be always available for the protection of wharf property. Two were constructed, one being a machine of great power, with pumps made to be worked by 120 men. These machines proved of great value. In 1852, shortly after the memorable fire at Humphrey's warehouses, he persuaded the Fire-engine Committee to allow one of these engines to be altered so as to work by steam, and in 1855 a large self-propelling floating steam fire-engine was made upon a novel construction, and which, having already rendered great service at fires on the river side, still ranks as the most powerful machine in the service of the brigade. With locomotive boilers and large double steam engines, this float can steam nine miles an hour, and when in place at a fire it can throw four streams of water, each from a jet-pipe of 1-1/2 inch in diameter, to a great distance. In the great fire of 1861, this floating engine was worked with but little intermission for upwards of a fortnight. In 1860 Mr. Braidwood obtained the sanction of the Fire-engine Committee for the introduction of a land steam fire-engine, and although he did not live to witness the present remarkable development of these machines, he was enabled to employ the first one in the brigade with much advantage. We may quote here from a brief but excellent memoir of Mr. Braidwood, which appeared in the annual report of the Institution of Civil Engineers for 1861: