Page:Dictionary of National Biography, Second Supplement, volume 1.djvu/334

 H.M.S. Hood, which lay in the Medway off Gillingham. In 1878 he was acting adjutant of the submarine miners at Portsmouth, and became in the same year (1 April) assistant instructor in electricity at Chatham.

In addition to his work of instruction Cardew assisted in carrying out some important experiments with electric search-light apparatus for the royal engineers committee, at a time when the subject was in its infancy. The need of better instruments for such work led him to design a galvanometer for measuring large currents of electricity (cf. description in paper, read before Institution of Electrical Engineers, 25 May 1882). He next evolved the idea of the hot-wire galvanometer, or voltmeter, the value of which was universally recognised among electricians. He was awarded the gold medal for this invention at the Inventions Exhibition in London of 1885. He also originated a method of finding the efficiency of a dynamo.

Cardew's invention of the vibratory transmitter for telegraphy was perhaps his most important discovery, and in the case of faulty lines proved most useful, not only on active service in the Nile expedition and in India, but also during heavy snowstorms at home. Cardew received a money reward for this invention, half from the imperial and half from the Indian government. The utility of the invention was much extended by Cardew's further invention of 'separators,' consisting of a combination of 'choking coil' and two condensers. These instruments enable a vibrating telegraph circuit to be super-imposed on an ordinary Morse circuit without interference between the two, thus doubling the message-carrying capability of the line. His apparatus for testing lightning conductors was adopted by the war department for service. Promoted captain on 4 Jan. 1883, and major on 12 April 1889, Cardew was from 1 April 1882 instructor in electricity at Chatham. On 1 April 1889 he was appointed the first electrical adviser to the board of trade. He held a long inquiry into the various proposals for the electric lighting of London, and drew up valuable regulations concerning the supply of electricity for power and for light. Cardew retired from the royal engineers on 24 Oct. 1894, and from the board of trade in 1898. He then entered into partnership with Sir William Preece & Sons, consulting engineers, and was actively engaged on large admiralty orders, involving an expenditure of 1,500,000l. He joined the board of the London, Brighton and South Coast railway in 1902. Cardew paid two visits to Sydney, New South Wales, in connection with the city's electrical installations. Soon after his return home from the second visit in 1909, by way of Japan and Siberia, he died on 17 May 1910 at his residence, Crownpits House, Godalming. In 1881 Cardew wrote a paper on 'The application of dynamo electric machines to railway rolling stock'; in 1894 he contributed a paper to the Royal Society on 'Uni-directional currents to earth from alternate current systems'; and in 1901 he delivered the Cantor lecture before the Society of Arts on 'Electric railways.' He contributed several papers to the Institution of Electrical Engineers, on whose council he served for many years, and was vice-president in 1901-2.

Cardew married in London, on 19 June 1879, his first cousin, Mary Annunziata, daughter of Mansfield Parkyns [q. v.], the Abyssinian traveller. She survived him with three sons and two daughters.

 CAREY, ROSA NOUCHETTE (1840–1909), novelist, eighth child and fourth daughter of William Henry Carey, shipbroker, by his wife Maria Jane, daughter of Edward J. Wooddill, was born at Stratford-le-Bow, London, on 24 Sept. 1840. Her childhood was spent at Hackney. She was educated first at home and later at the Ladies' Institute, St. John's Wood, where Mathilde Blind was a school-fellow. The friendship then formed was interrupted later by the divergence of their religious opinions. As a child she wrote little plays for her brothers and sisters to act, and invented stories for their amusement. Her first novel, 'Nellie's Memories,' told verbally in this way when in her teens, was published in 1868, and was immediately successful. Henceforward her career as a writer was assured. More than 52,000 copies of this book have been sold. Between 1868 and the year of her death Miss Carey published thirty-nine novels. The large sales, varying between 41,000 and 14,000 copies, testify to their popularity. Those which enjoyed the widest vogue were 'Wee Wifie' (1869); 'Wooed and Married' (1875); 'Not like other Girls' (1884); 'Uncle Max' (1887), 