[86] Invented by Mr. John F. Allen.
[87] Or not far from 600 times the cube root of the length of stroke, measured in feet.
[88] Perkins was a native of Newburyport, Mass. He was born July 9, 1766, and died in London, July 30, 1849. He went to England when fifty-two years of age, to introduce his inventions.
[89] It was when writing of this engine that Stuart wrote, in 1824: “Judging from the rapid strides the steam-engine has made during the last forty years to become a universal first-mover, and from the experience that has arisen from that extension, we feel convinced that every invention which diminishes its size without impairing its power brings it a step nearer to the assistance of the ‘world’s great laborers,’ the husbandman and the peasant, for whom, as yet, it performs but little. At present, it is made occasionally to tread out the corn. What honors await not that man who may yet direct its mighty power to plough, to sow, to harrow, and to reap!” The progress of the steam-engine during those forty years does not to-day appear so astounding. The sentiment here expressed has lost none of its truth, nevertheless.
[90] Galloway and Hebert, on the Steam-Engine. London, 1836.
[91] “The High-Pressure Steam-Engine,” etc. By Dr. Ernst Alban. Translated by William Pole, F. R. A. S. London, 1847.
[92] Invented by Joseph Maudsley, of London, 1827.
[93] January, 1884, over 120,000 miles.
[94] Railroad Gazette.
[95] The steam-cylinders of the engines of steamers Bristol and Providence are 110 inches in diameter and of 12 feet stroke.