Nor did the general confine himself to mere verbal descriptions of his machines; many of them were constructed and erected under his own eye, in Queen's Square Place, amongst which may be mentioned an apparatus for making wheels, and another for making all the parts of a window-sash frame; both of these leaving nothing for the skilled workman to do, save putting the pieces together. There were also planes of various descriptions, saws for cutting extremely fine veneers, machines for boring, dovetailing, cutting stone, &c., &c. Machines for metal-work were not, however, attempted, on account of the difficulty of obtaining the necessary power for working them, the Queen's Square Place apparatus being all worked by men. The fame of this machinery attracted many visitors, amongst others Mr. Secretary Dundas (afterwards Lord Melville), who stated in the House of Commons that it opened a new era in the manufacturing prosperity of the country. But the circumstance which completely changed Bentham's future destiny, was the frequent visits of Earl Spencer and the Lords of the Admiralty, who soon perceived the advantages which would accrue to the state by engaging the general in the British service. Various proposals were made by the Admiralty to engage him permanently in the public service; but Bentham refused all in which he had not the individual responsibility. Ultimately a new office was created for him, under the name of Inspector-General of Naval Works; not, however, without the fierce opposition of the Naval Board, who, although unable to change the title of the office, managed to reduce the salary from the sum of 2000_l._ per annum, as originally proposed, to 750_l._ nominal, with an addition finally agreed upon of 500_l._ a year--in all, 1250_l._ per annum. Notwithstanding this opposition, Bentham, convinced of the services he could render, gave up the honours and riches which awaited him in Russia--amongst others, an estate promised him on his return--and determined to devote his energies to his native country, regardless of all pecuniary advantages. During the interval which elapsed before the actual institution of his new office, Bentham was authorized by the Lords of the Admiralty, early in 1795, to build seven experimental vessels; into these he introduced many improvements, amongst which may be mentioned diagonal braces, metallic tanks for water, metallic canisters for powder, means for filling the magazine with water in case of fire, safety lamps, &c.