Suffield, studied surveying—Henry Merwin of Granby studied Surveying, Jefferson Cooley, a graduate of Yale College, studied surveying and civil engineering. He had also students from Granville Mass. But the school interfered with his other business, and he discontinued it. He manufactured about this time a good many sets of surveyors instruments—compasses, chains, scales, protractors, and dividers, some for his pupils and some for others. He also manufactured, magnets, electrical machines, leveling instruments, and some others. He was greatly attached to the business of surveying, and had more applications than he could attend to. He was compelled to leave it in 1825, and go into the business of civil engineering, which also in a few years, gave way for the business of manufacturing telescopes. At the commencement, he never thought of its ever becoming a business of profit. About the year 1830 he had completed an achromatic telescope, which he took to New Haven, and asked Prof. Benjamin Silliman to look at it. He did so, and at once took an interest in it, and published a notice of it in the American Journal of science, of which he was editor. He manufactured principally Reflecting telescopes, of the Herschelian kind. About the year 1833, he began to have orders for telescopes. Among these orders was one from William J. Young, a celebrated Philosophical instrument maker of Philadelphia, who wanted two small diagonal metallic reflectors for two Transit instruments that he was making. Mr Holcomb made the articles wanted, and thought he would take them and a telescope and visit Philadelphia. Mr Young introduced him to the late Sears C. Walker, and Mr Walker introduced him to Mr Hamilton, Actuary of the Franklin Institute of the State of Pennsylvania, and the Actuary appointed a committee to examine the telescope. He selected the committee from the standing committee on Science and the Arts of the Institute. Mr Patterson of the Mint, Alexander D. Bach superintendent of the Coast survey, Dr Robert Hare the chemist, James P. Espey, Sears C. Walker, Isiah T. Lukens and some others. These were among the first scientific men of America. The committee examined the telescope, and compared it with others of European manufacture. The Report of that committee may be found in the Journal of the Franklin Institute Vol. 14 p. 169. The next year 1835 he took a larger telescope to Philadelphia, and offered it to the same committee for examination and comparison with European telescopes. That Report may be found in the Journal of the Franklin Institute Vol 16 p. 11. The next year 1836 he presented a Telescope 14 feet long to the same committee. Their report may be found in the Journal of the Franklin Institute Vol. 18 p. 312. These Reports furnish the best information in regard to the performance of these telescopes. The committee gave them a high character, and they were sold in almost every state in the Union.