Manual for the Thornycroft Mark I Depth Charge or Bomb Thrower
A 17 page bound manual for the Mark I Thornycroft Bomb Thrower for "D" Pattern Depth Charges, including description and spare part List dated 1st September 1917, marked secret & confidential. Published by John I. Thornycroft & Co. Ltd. of Caxton House, London SW1 and printed by Vacher & Sons Ltd.
