7 
2527 
mi 
2529 
2530 
2531 
2532 
2533 
2534 
2535 
2536 
2537 
25.38 
2539 
2541 
2542 
2543 
2545 
2546 
2547 
2548 
2549 
2550 
2551 
2552 
2553 
2554 
2555 
2561 
2562 
2563 
2564 
2565 
2567 
2568 
2569 
2570 
2571 
2572 
Impression taken of 9-inch M.L. rifled compound gun, after firing 239 rounds 
in addition to 20 rounds battering charges in smooth-bore state, 
do after firing 339 rounds, in addition to do 
do do 439 do 
Impressions taken right, left, and up, of 9-inch M.L. rifled compound gun, 
after firing 489 rounds in addition to 20 rounds battering charges in 
smooth-bore state. 
Impression taken up do. 
Impression taken from muzzle to left of up do. 
Impression taken left and up, after firing 500 rounds, 64-pr. M.L. rifled gun. 
Impressions taken left and up of 64-pr. M.L. rifled gun after firing 1000 
rounds. 
Impressions taken left and up, after firing 1500 rounds. 
do do 2000 rounds. 
Target representing the Plymouth breakwater fort, in course of construction. 
Placing uprights in position, 
do Uprights fixed. 
do First layer of horizontal plate and planks in position, 
do Second layer of perpendicular plate and planks in position, 
do Third layer of horizontal plates in position, 
do Shewing construction of iron roof, 
do The brickwork filling of roof. 
do Method of securing the uprights to roof, and the plan 
adopted for filling in the concrete, 
do Method of securing the curved 5-inch plates, 
do End view, shewing the three layers of plates and planks. 
Milhvall shield, shewing the hollow stringers and the filling in with wood 
and 1" irons. 
Mill wall shield, bottom 9-inch armour plate in position. 
Front of Millwall shield, completed. 
Back of do. 
Steel plate brackets after two rounds 9-pr. common shell, May 13, 1868. 
Gun-metal nave, after one round 9-pr. common shell, May 13, 1868. 
Cast-iron nave, after one round 9-pr. common shell, May 13, 1868. 
Wrought-iron brackets after four rounds 9-pr. common shell, May 13, 1868, 
do do 
Wood nave after one round 9-pr. common shell, May 13, 1868. 
Front of Millwall iron planks, continuation of proof, March 30, 1868j 
68-pr. S.B. gun. 
Back of do. 
Front of Millwall iron planks, continuation of proof, March 31, 1868, 
68-pr. S.B. gun. 
Back of do. 
Front of do. 
Back of do. 
Front of Millwall iron planks, continuation of proof, April 6, 1868, 
68-pr. S.B. gun. 
Back of do. 
Front of do. 
Back of do. 
Front of Millwall iron planks, continuation of proof, April 20, 1868,' 
68-pr. S.B. gun. 
Back of do. 
Front of do. 
Back of do. 
