Illustrations 



Figure Page 



George Escol Sellers (i 808-1 899) Frontispiece iv 



1 Coleman Sellers (1 781-1834) xiv 



2 Sophonisba Angusciola Peale Sellers ( 1 786-1859) xv 



3 High Street, Philadelphia, looking west xvi 



4 Patrick Lyon, craftsman, at age 24 in 1 799 3 



5 "Pat Lyon at the Forge," by John Neagle, 1829 5 



6 Philadelphia-type hre engines of about 1800 7 



7 Patrick Lyon's fire engine Diligent, 1820 9 



8 "Hydraulion" fire engine and hose, about 1825 10 



9 Jacob Perkins (1 766-1849) 13 



10 Asa Spencer's scroll lathe, with geometric chuck, 1820 14 



1 1 Engraving showing scroll work and siderographic duplication of 1 7 



figures. 



1 2 Merrick & Agnew fire engine, about 1830 19 



13 Rowntree fire engine, about 1830 23 



14 Perkins triangular-valve ship pump 25 



15 231 High Street, the "Market Street Store" of Nathan Sellers .... 28 



16 Screw press, 1822 33 



17 John White's screw cutting lathe, about 1817 35 



18 Oliver Evans (1 755-1819) 37 



19 Pumping engine of Philadelphia Water Works, about 1801 39 



20 B. H. Latrobe's drawing of Center Square building, 1799 41 



21 Center Square Water Works, Philadelphia, 1807 42 



22 Great wheel lathe and pole lathe 45 



23 Samuel Morey's turpentine engine, 1826 47 



24 Isaiah Lukens (1 779-1846) 53 



25 Lukens's lithontriptor, 1825 55 



26 Maudslay's lathe and slide-tool, about 1807 56 



27 Tyler's lathe, 1828 57 



28 Slide-rest as built by Sellers about 1820 58 



29 Baldwin and Mason slide-rest, 1827 5g 



30 The second U.S. Mint, Philadelphia 61 



31 Coining press, U.S. Mint, about 1800 63 



32 Coining press, enlarged view 64 



33 Arcade Building, Philadelphia 65 



34 Steam engine designed by Franklin Peale 67 



35 First steam coining press, U.S. Mint, 1836 68,69 



36 Medal coined on the steam coining press, March 23, 1836 71 



37 Pressing and milling room of the U.S. Mint, Philadelphia 72 



38 Coin milling machine, designed by Franklin Peale 73 



39 Main steam engine at the U.S. Mint, Philadelphia 75 



viii 



