A ship's magnetic landing compass bowl and gimbal, the bowl signed and numbered Dent & Co London No 47535 Patt 24c No 306, the spirit dampened quadrantly divided card signed Dent Co & Johnson Ltd Captain Chetwynd's Patent No 25965/06, with prismatic fore-sight with two shades and black-glasss sun reflecter in mahogany mounting box with top cover -- 10in (25cm) square