English, c.1910, signed on a plaque to the inside of the lid 'Harry W Cox Ltd, Actual Makers of X-Ray & Wireless Telegraph Apparatus, 9, 10 & 11 Cursitor St Chancery Lane London', the large mahogany case with fold down panel to end with breaker connection, with spark gap in lid, untested AF with two standard resisters both marked for ICST Phys Lab A, coil case width 65cm