in 1817 by the British Army. Each pontoon was split into two-halves and you could connect two pointed ends together in cases where you had tidal flow. Each half was enclosed, so reducing the risk of swamping and there were multiple lashing points. The "Pasley Pontoon" lasted until it was replaced in 1836. Concurrently, Pasley was gazetted brevet major. He became brevet lieutenant-colonel in 1813 and substantive lieutenant-colonel in 1814. The first volume of his Military Instruction appeared in 1814 and contained a course of practical geometry which he had framed for his company at Plymouth. Two other volumes completing the work appeared by 1817 and dealt with the science and practice of fortification, the latter comprising rules for construction. He published a work on Practical Architecture and prepared an important treatise on The Practical Operations of a Siege (1829–1832), which was translated into French (1847). He became brevet colonel in 1830 and substantive colonel in 1831. From 1831 to 1834, he focused his attention on the standardization of coins, weights and measures, publishing a book on the topic in 1834. In 1838, he was presented with the freedom of the city of London for his services in removing sunken vessels from the bed of the Thames near Gravesend. From 1839 to 1844, he was occupied with clearing away the wrecks of from Spithead and from St. Helens. All this work was subsidiary to his great work of creating a comprehensive art of military engineering. Railway Inspectorate On 23 November 1841, on promotion to the rank of major-general, he was made an inspector-general of railways, replacing Lieutenant-Colonel Sir Frederic Smith. During this period of intense activity on the new railway network, he inspected many new lines, criticising the haste in which some were opened to poor engineering standards. However, he came under criticism for his approval of the North British Railway's line from Edinburgh to Berwick in June 1846; the bridges and earthworks failed to withstand heavy rain in September 1846 and nineteen miles of track were rendered unusable. Temporary works were undertaken to restore a service, Pasley approved them (orally), but some of the new work then proved faulty. In November 1846, the inspectorate was reorganised, with no post for Pasley in the new structure: on vacating this appointment, he was made a K.C.B., and thenceforward was chiefly concerned with the East India Company's military seminary at Addiscombe. He