In the year 1882, Messrs. Elwell, Parker, and Co., commenced electrical business in Wolverhampton, with secondary or storage batteries constructed upon a modification of the Planté method of manufacture. Shortly afterwards, the same firm began to make dynamos for charging their batteries, since which time the output has increased, and now amounts to a total of about 500 dynamos, besides several thousands of storage cells, the latter being now made under the joint Patents of the Wolverhampton Firm, and the Electrical Power Storage Co., Limited, of London. The London Stock Exchange, Lloyd’s Shipping Offices, the Manchester Art Gallery, Lord Shrewsbury’s seat at Ingestre Hall, the Lancashire and Yorkshire Railway Co., the Blackpool Electric Tramway, the Giants’ Causeway Electric Tramway, the Cannock Chase Colliery, the Grosvenor Gallery and many other establishments are lighted or worked by means of dynamos manufactured by the Wolverhampton firm. Amongst installations set up in Birmingham under the writer’s superintendence may be mentioned the Theatre Royal, in New Street, and the Prince of Wales Theatre, in Broad Street, in each of which the plant consists of a 16-H.P. Otto silent gas engine, driving a 300 light Ferranti alternate current dynamo with a Siemen’s exciter, and with appliances at the prompt side for lowering or turning out the light at will. 200 lights are run very brightly with an expenditure of about 800 cubic feet of gas per hour. A similar number of ordinary gas burners would require from 1,000 to 1,200 cubic feet of gas per hour. The Birmingham Liberal Club, in Congreve Street, another example, has 160 lamps which are worked from a 10-unit compound dynamo, made by Messrs. Crompton and Co., of Chelmsford, the motive power being a 12-H.P. compound steam engine, by Messrs. Marshall, Sons, and Co., Limited, of Gainsborough. This machine is an excellent specimen of a self-regulating dynamo, the commutator not having been touched with anything coarser than well-worn emery cloth since February last, its surface presenting a highly-polished appearance. No storage cells are used, the lighting being derived directly from the machine. In the suburbs, the house of Mr. Mitchell, Hagley Road, Edgbaston, has about 40 lights, and is worked from a 2-H.P. Otto silent gas engine, and a 2-unit Crompton shunt-wound dynamo, charging 24 storage cells of the E.P.S. (Electrical Power Storage Co.’s) type. The writer’s house, 7, Clarendon Road, Edgbaston, is also electrically lighted by 24 E.P.S. cells, charged by a 30-light Chamberlain & Hookham dynamo, worked from a ½-H.P. Otto gas engine.