Ham, James fl. 1754-1764 New York and Mathematical Philadelphia Ham, James, Jr. fl. 1780 Philadelphia Mathematical Hamlin, William 1772-1869 Providence, R. I. Mathematical; nautical; astronomical Hanks, Benjamin 1755-1824 Mansfield and Surveying Litchfield, Conn. Hanks, Truman fl. 1808 Mansfield and Surveying Litchfield, Conn. Harland, Thomas 1735-1807 Norwich, Conn. Surveying; clocks Heisely, Frederick 1759-1839 Frederick, Md.; Mathematical; A. Lancaster, surveying; clocks Harrisburg, and Pittsburgh, Pa. Heisely, George 1789-1880 Harrisburg, Pa. Clocks; mathematical Hinton, William fl. 1772 New York Mathematical Hoff, George 1740-1816 Lancaster, Pa. Clocks; surveying Holcomb, Amasa 1787-1875 Southwick, Mass. Surveying; (also practitioner) astronomical Hooker & Fairman before 1810 Newburyport, Mathematical (William Hooker and Mass. Gideon Fairman) Houghton, Rowland c. 1678-1744 Boston Surveying Huntington, Gurdon 1763-1804 Windham, Conn., Surveying and and Walpole, N.H. other; clocks Jacks, James fl. 1780's Charleston, S.C. Mathematical; surveying Jayne, John late 18th Salem, Mass. Mathematical century Kennard, John 1782-1861 Newmarket, N.H. Surveying; clocks Ketterer, Alloysius fl. 1789 Philadelphia Glass King & Hagger 1759 or 1760 Newport, R.I. Mathematical; (Benjamin King and until early nautical William Guyse 1760's Hagger) King, Benjamin 1707-1786 Newport, R.I. Mathematical; nautical King, Benjamin 1740-1804 Salem, Mass. Nautical King, Daniel 1704-1790 Salem, Mass. Mathematical King, Samuel 1748-1819 Newport, R.I. Mathematical Lamb, A. & Son 1780's New York Mathematical Lamb, Anthony 1703-1784 England; Mathematical; Virginia; surveying; nautical Philadelphia; New York; Hunter's Key, N.Y.