Schneider-Canet 47mm L/30 semiautomatic gun 

Bulgarian designation :47-мм оръдие Д-30 “Шнайдер”Schneider designation :Canon semi-automatique de 47mm de 30 calibres sur affût de bord à pivot centralCalibre :47mm L/30Weight :120 kgWeight of the mounting :Barrel length :1.410 mRifling twist :uniform right-handedNumber of barrel grooves :16Common shell weight :1 kg – charge : 54 g of smokeless powder B.N.Piercing shell :1 kg – charge : 35 g of smokeless powder B.N.Case shot :1 kg – 61 round ballsMuzzle velocity :625 m/sMax. range :5000 mElevation :+ 15° / - 10°Remarks :Semiautomatic naval gun. Bulgarian Navy bought 12 of these guns, that were mounted on the on the six torpedo boats of the Darzki class in 1907-08.