_New York Daily Advertiser_, 28, 33, 53 _New York Gazette_, 28, 51, 53, 66 New York Historical Society, 33, 39, 66 _New York Mercury_, 66 _New York Packet_, 29, 51, 53 Noble, James, 81 _Norwich Courier_, 30 Norwood, R., 10 Odell, 146 Ohio Historical Society, 55, 61 Ohio State Museum, 16, 51, 52, 55, 59, 60, 61 Old Sturbridge, 90, 107, 153 optical instruments, 26, 28 orrery, 15, 16, 39, 40, 41 Osborn, John, 96 Paine, Robert Treat, 82 Thomas, 82, 83 Palmer, Brooks, 39, 47, 63, 123 Parker, N., 153 Parmele, Ebenezer, 67 Partridge, Marty, 81 Paul, Amos, 129 Temple, 129 Peabody Museum, 85, 96, 97, 139, 153 Peale, Charles Wilson, 14 Pease, Elizabeth Folger, 45 Paul, 45, 158, 164, 169 Pell, Edward, 84 Pemberton, James, 30 _Pennsylvania Evening Herald_, 33 _Pennsylvania Magazine_, 30 _Pennsylvania Packet_, The, 15 Pennsylvania, University of, 8, 15, 16 perpetual log, 51 Phillips, John M., 107 Jonathan, 99 Mrs. Mary W., ix Pierce, Abner, 139 Pierpont, John, 68 Pitt, William, 24 Pitts, James, 86 planetarium, 36 planisphere, 51 Platt, Adah, 49 Augustus, 49, 52, 158, 163, 168, 171 Benjamin, 49, 51, 158, 160, 162, 163, 167, 171 William Augustus, 49 _Plymouth Journal & Massachusetts Advertiser_, 112, 113 Pope, Joseph, 39, 41, 158, 161, 167 Potter, John, 43, 158, 161, 171 Potts, Thomas, 12 W. L., 158, 163 Power, Alexander, 7 Price, Derek J. de Solla, ix, 3, 130 Priestley, Frances D., 140, 142 Dr. Joseph, 131, 140, 141, 143 Prime, Alfred Coxe, 29, 31, 63 Prince, John, 24, 158, 161, 162 Nathan, 8, 158 Princeton University, 15 Pryor, Thomas, 59, 159, 164, 168 Quincy, Abraham, 96 Rathborne, Aaron, 9, 10 Ratsey, Widow, 65 Revere, Paul, 38, 39, 40, 41, 42, 97, 113, 116, 117, 159, 161, 168 Reynolds, John E., 131, 134 William, 134 Reworth, Captain, 87 Rhode Island Historical Society, 45, 46, 139 Riley, Stephen T., ix Ritchie & Co., Bern C., 139 Rittenhouse, Benjamin, 11, 15, 16, 142, 144, 159, 164, 165, 171 David, 11, 12, 14, 15, 16, 20, 21, 47, 62, 142, 144, 145, 146, 147, 159, 163, 164, 165, 171 Rittenhouse & Evans [David Rittenhouse & David Evans], 139, 146, 148, 159, 171 Roberts, Gideon, 67 Nathaniel, 85 Romaine, Lawrence, 88 _Royal Pennsylvania Gazette_, 59 Royal Society of London, 58 Rutgers University, 26 Salter, Titus, 124 sand glasses, 59 Savage, James, 4, 80, 84 Schiff, Henry G., 107 Schoen, H. H., 7 Seybold, R. F., 7 Shampeny, Worth, 153 Shepley Library, 139 Sheppard, Jack, 29 Shillcock, Hannah, 94 Joyce, 94 Robert, 93 Shoemaker, Mrs. Francis D., 140 Shrimpton, Shute, 87 Sibley, Asa, 120, 121 Sibley & Marble [Clark Sibley and Simeon Marble], 47, 159, 160, 167, 168 Sign of the Cross-Knives and Gun, At the, 53, 76