Plate, diagrams showing action of soft iron rods on compass by unknown artist Plate X containing nine diagrams showing the action of soft iron rods on board a ship on the ship's compass. Lithographed by Malby and Sons. Subject: Engineering Published in Philosophical Transactions as 'On the magnetic character of the armour-plated ships of the Royal Navy, and on the effect on the compass of particular arrangements of iron in a ship'. Received by the Royal Society on 9 March 1865. Read 16 March 1865. [1865]