The mechanic arts were also much improved by him. He brought to their aid philosophy and chemistry, and combined them with science, economy, and nature. He improved the chimneys, constructed a stove, and proposed many useful and economical corrections in domestic concerns, from the garret to the cellar, from the plough to the mill. Science acknowledged his master spirit, the arts hailed him as their patron, the lightning bowed in subjection to his magic rod, and nature claimed him as her favourite son. In 1744, he was elected a member of the provincial assembly, where he was continued for ten successive years. Although not a popular speaker, his clear head and sound judgment, as a legislator and a statesman, gave him an influence over that body before unknown. During the years he was serving his country in the assembly, he also served in the fields of experimental philosophy, and explained many of the mysterious phenomena of nature, that spread his fame to the remotest bounds of the civilized world. His discoveries in electricity alone, were sufficient to have immortalized his name. He was the first man on record who imparted magnetism to steel—melted metals, killed animals, and fired gunpowder by means of electricity; and the first who conceived and reduced to practice, the method of conducting lightning from the clouds to the points of steel rods, and, by them, harmless to the ground. All the elements and fluids, the air, sea, and land, underwent the close investigation of his vast, his philosophic mind. In 1758, he was sent to Carlisle to conclude a treaty with the Indians; and in the following year, to Albany, to meet a congress of commissioners, to arrange means of defence against the threatened hostilities of the French and savages. He there submitted a plan that met with the unanimous approbation of the commissioners, but was so republican in its features, as to be rejected by those who had at heart the interests of their king more than the happiness of the colonists. On the decease of the deputy post-master general of America, Franklin succeeded him, and raised the department from a state of embarrassment and expense, to a fruitful source of revenue to the crown.