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Gleaner-class Gunboat
The ''Gleaner'' (or ''Pelter'')-class gunboat was a class of six gunboats built for the Royal Navy in 1854 for use in the Crimean War. Design The ''Gleaner'' class was designed by W.H. Walker (who also designed the subsequent and es). The ships were wooden-hulled, with steam power as well as sails, but of shallow draught for coastal bombardment in the shallow waters of the Baltic Sea, Baltic and Black Sea during the Crimean War. Propulsion Two-cylinder horizontal single-expansion steam engines built by John Penn (engineer), John Penn and Sons, with two boilers, provided 60 Horsepower#Nominal horsepower, nominal horsepower through a single screw, sufficient for . Armament Ships of the class were armed with one 68-pounder British ordnance terms#SBML gun, smooth bore muzzle loading cannon (SBML), one 32-pounder SBML (originally two 68-pounder SBMLs were planned but the forward gun was substituted by a 32-pounder) and two 24-pounder howitzers. Ships References Bibliography [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Builder's Old Measurement
Builder's Old Measurement (BOM, bm, OM, and o.m.) is the method used in England from approximately 1650 to 1849 for calculating the cargo capacity of a ship. It is a volumetric measurement of cubic capacity. It estimated the tonnage of a ship based on length and maximum beam (nautical), beam. It is expressed in "tons burden" ( en-em , burthen , enm , byrthen ), and abbreviated "tons bm". The formula is: : \text = \frac where: * ''Length'' is the length, in foot (length), feet, from the stem (ship), stem to the sternpost; * ''Beam (nautical), Beam'' is the maximum beam, in feet. The Builder's Old Measurement formula remained in effect until the advent of steam propulsion. Steamships required a different method of estimating tonnage, because the ratio of length to beam was larger and a significant volume of internal space was used for boilers and machinery. In 1849, the Moorsom System was created in the United Kingdom. The Moorsom system calculates the cargo-carrying capaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |