Sellers, James, and Sellers & Pennock, 2, 43, 50; and 

 "Hydraulion," 6 n; and leather hose, 8 



Sellers, John, xix, 89 



Sellers, Nathan, xiv, xvii, 87, 106; and firm of N. & D. 

 Sellers, 8; his Market Street store, 28, 29, 30; 

 and John White, 34; on Philadelphia water 

 works, 37, 38, 40; and Redheffer, 79, 80, 82; 

 portrait. 89; biogr. notes, 89; his wire and mold 

 work, 89-95, '68; at Cardington, 107 



Sellers, Rachel B. Parrish, xvii, 173 n 



Sellers, Samuel, 2, 8, 43 



Sellers, Sophonisba, xiv, xviii; portrait, xv 



Sellers, N. & D. (firm), 8, 70; formed, 89; annealing 

 furnace of, 94; faces paper cylinder, 89; mold 

 makers, 106 



Sellers and Brandt (firm), 166, 169 



Sellers and Pennock (firm), 53, 160; formed, 2; 

 description of shops, 43-51 (See also "Hydrau- 

 lion"; Pennock, Abraham) 



Sellers & Sons, Coleman (firm), advertisement, 179 



Sellers family genealogy, xix 



Severs, I. L., 10 1 



Sharp, attorney-general of Barbadoes, in, 114 



Sharp and Roberts, planer of, 1 12 



Sheer, E. R. (pianoforte maker), 126 



Shryock, George (paper maker), 101, 106 



slide rest: Maudslay, 44, 56 (illustr.), 107; Lukens, 

 54~55> 57) 58 (illustr.); Baldwin and Mason, 

 59 (illustr.), 1 12 (See also lathe) 



Sloan, J., and house heating, 133, 177 



Smith, Francis Gurney, 52 n 



Smith and Winchester (paper machine builders), 101 



Smithsonian Institution, publication of GES, xviii 

 (See also Henry, Joseph) 



snag boats, 191 



Society of Arts, London, 1 1 7 



Southwark Foundry, 74 n 



Spencer, Asa, 136, 138; biogr. notes, 13; his lathe, 

 14 (illustr.); to England, 28 



stage lines, 144-146 



Starr, Moses (boilermaker), 164, 165 



State House (See Independence Hall) 



steamboats, 144, 145, 146 



steam engine, high pressure, 26-28; of Oliver Evans, 

 36, 37, 38 and n, 72, 180, 182-184; Boulton and 

 Watt type, 36, 38, 39; at U.S. Mint, 62, 67, 

 75 (illustr.), 77; Rush and Muhlenberg, 72; 

 horizontal, of GES, 73-74; cut-off valves, 73, 

 185; Baldwin, vertical, 181-182, 186 (illustr.) 

 (See also Evans, Oliver) 



steam gun, 27-28, 132 



steel, hardening and annealing, 13-15 

 Stephenson, George, 70 n, 149 n, 163, 184; GES inter- 

 views, 134 

 Stephenson, Robert, 163 

 Stevens, John, and screw propeller, 184 

 Stevens, Robert L., 149 n 

 Stevens & Stockton Steamboat Line, 145 

 Stevenson, David, on portage railroad, 147 n, 148 n, 



'53 



Stevenson, Robert Louis, nephew of David Stevenson, 



153 



Stewart, Frank H., and U.S. Mint, 61 



Stillman, James, 160 n 



Strickland, William, 54; on architecture, 40; designs 



mint building, 61 (illustr.), 62, 67 

 Stuart and Revett, Antiquities of Athens, 40 and n 

 Stubs, Peter (toolmaker), 125 

 Sully, Thomas, designs coin, 74, 77 

 Swann, James (paper maker), 110-111, 117, 119 

 temperature indicator, furnace, 93 _ 94 

 textile machinery (See card; Brandt, John) 

 Thames tunnel (See under tunnel) 

 Thompson, Benjamin, Count Rumford, 66 

 Thornton, William, 16 



toggle, press, 16; capstan, 16,20-21 (See also coining) 

 tools, hand, early tools of GES, 29-30; American and 



English, 112, 125; hand-forged bit-stock of GES, 



169 

 Trautwine, John C, 170; schooling, xv, 54; and 2nd 



U.S. Mint, 67, on Philadelphia & Columbia, 



148-149, 150 

 Troughton, John (instrument maker), 121 

 tunnel, Lancaster & Harrisburg Railroad, 163 

 portage railroad, 1 54 

 Thames, 113 (illustr.); GES visits, 114-115, 117; 



mentioned, 109 

 Tyler, Rufus, 77, 112; biogr. notes, 15 and n; slide 



rest of, 54; GES on, 55 n; lathe of 57 (illustr.); 



and Redheffer, 84 

 Tyndall, John, 66 

 Union Steamboat line, 145 

 United States Bank, notes of, counterfeited, 135, 



137-138 

 United States Mint (See under Mint) 

 Ure, Andrew, 1 16 



Vail and Son, Morristown, N.J., 188 

 Washington, D.C., fire engines for, 6, 44; GES in, 



191-192 

 Washington, George, President, xvi 

 watermarks, 95, 138-139 

 water works, Philadelphia, 6, 1 5, 37-42 passim 



202 



