Charles Holtzapffel, another well-known engineer of that generation, was the son of a German mechanic who came to London in 1787. He received a good education, theoretical as well as practical, and became a skilled mechanician and a tool builder of wide influence. His principal book, “Turning and Mechanical Manipulation,” published in 1843 in three volumes, is an admirable piece of work. Covering a field much wider than its title indicates, it is the fullest and best statement of the art at that time; and scattered through it there is a large amount of very reliable mechanical history. By 1840 the number of men engaged in tool building was increasing rapidly, and it is impossible to consider many English tool builders who were well known and who did valuable work, such as Lewis of Manchester, B. Hick & Son of Bolton, and others. One noteworthy man, however, ought to be mentioned--John George Bodmer, who was neither an Englishman, nor, primarily, a tool builder.[71] He was a Swiss who worked in Baden and Austria, as well as in England, and his fertile ingenuity covered so many fields that a list of the subjects covered by his patents occupy six pages in the “Transactions of the Institution of Civil Engineers.” [71] For a “Memoir” of Bodmer see “Transactions of the Institution of Civil Engineers,” Vol. XXVIII, p. 573. London, 1868. Bodmer was born at Zurich in 1786. After serving his apprenticeship he opened a small shop for millwright work near that city. A year or so later he formed a partnership with Baron d’Eichthal and with workmen brought from St. Etienne, France, he started a factory in an old convent at St. Blaise, in the Black Forest, first for the manufacture of textile machinery and later, in 1806, of small arms.