Search the scanned history of knowledge.

VARLEY, CORNELIUS (1781-1873), English water-colour painter, a younger brother of John Varley (<?.».), was born at Hackney, London, on the aist of November 1781. He was educated by his uncle, a philosophical instrument maker, and under him acquired a knowledge ...

VALET (Fr. valet; O. Fr. vaslet), a term now restricted in meaning to that of a gentleman's personal servant. The origin of the word is debated. Du Cange (Glossarium, s. Valeti) explains it as the diminutive of vassallus, a vassal, the sons of vassalli being t

... and others, and the principle of self-excitation was suggested by Wilde, C. F. Varley (18281883), Siemens and Wheatstone (see DYNAMO). These machines about 1866 and 1867 began to be constructed on a commercial scale and were employed in the production of the ...

... ign. Modern types of influence machine may be said to date from 1860 when C. F. Varley patented a type of influence machine which has been the parent of numerous subsequent Varley,B forms (Brit. Pat. Spec. No. 206 of 1860). In it the machiae. field plates were ...

... in general use on the British postal lines is the " Cordeaux screw," but the " Varley double cup " is still employed, especially by the railway companies. The latter form consists (fig. l) of two distinct cups (c, C), which are moulded and fired separately, a ...

... rged. a sharp click is heard, and a similar observation was made by Cromwell F. Varley, who proposed to make use of it in a telegraphic receiving instrument.4 In Dolbear's instrument one plate of a condenser was a flexible diaphragm, connected with the telepho ...