32pr. S. B. B. L. Gun

A conversion from the 32 pr. SB gun of 42 cwt. cast iron 97.6 inches long: weight 42 cwt. carriage 14 cwt. 1 qtr (.9 ton) slide 13 cwt (.7 ton) Interrupted screw thread breech mechanism:
Gun crew 1 Captain and 6 gun numbers (1885 drill) or 1 captain and 5 gun numbers (1898 drill when using fixed ammunition)
Range 500 yards point blank
Charge 3lbs. R.L.G.3 Silk cloth no.1 class hooped with silk braid and choked with silk twist.
Projectile case shot - made of sheet iron in three segments. It contains 730 mixed metal balls 16 per lb the interstices being filled with powdered clay and sand.
Intended for use in flanks and caponiers. It fires over a parapet of 2ft. 3-inches with 10 degrees of elevation and 15 degrees of depression. Maximum recoil is 1ft. 8inches. The pattern was submitted for approval in 1882 although it was decided upon in 1878. 269 were required for the defences but in 1882 15 were manufactured. It was decided that as the flank defence was the least important part connected with the armament of a fortress any smoothbore gun of small field calibre would suffice. No more were therefore to be made without special orders.By 1885 Crownhill Fort received 14 x 32 prs as part of it's peace-time armaments. In 1890 and 1891 trials took place at plymouth to discover the efficiency of the breech mechanism. A rate of fire of four rounds in 32 seconds was achieved.