A lovely ventometer by W.J.Jeffery & Co marked A.Kerr on the front.
W.J. Jeffery & Co was founded by William Jackman Jeffery (1857–1909), who started his career in the gun trade in 1885 working in the front shop of Cogswell & Harrison. In 1887 Philip Webley appointed Jeffery manager of P. Webley & Son’s London showroom at 60 Queen Victoria Street. Webley later abandoned their London operation and in 1890 Jeffery formed a partnership with a man by the name of Davies and Jeffery & Davies started trading from 60 Queen Victoria Street. This partnership was short lived and in 1891 the firm was renamed W.J. Jeffery & Co, still operating out of the Queen Victoria Street store. In addition to building new firearms, W.J. Jeffery & Co was a trader in second hand firearms, by 1892 offering over 1000 for sale. In 1898 the firm opened a shop at 13 King Street, St James’s, and by 1900 the company was a full-scale gunmaker with a workshop at 1 Rose and Crown Yard, near to the King Street shop.
Definition of ventometer: an instrument for indicating the velocity of the wind especially as designed for use on target ranges