Armstrong guns. Returns of expenses incurred on all classes of armstrong guns, their fittings, projectiles, &c., including 100-pounder smooth-bores, since the date of the return furnished to Mr. Monsell's committee; showing details of all alterations and changes, and the present cost of breech-loading and other armstrong guns; and, of the number and nature of armstrong guns exchanged from the several ships of the Channel Squadron at Plymouth in May 1864; &c [electronic resource].