Grit separation from grinding-rooms. Grinding machine for twist drills..... GRINNELL, F. H., disc., standard pipe and pipe threads.. Grouting under engine bed-plates..... Grüson armor tests.... V. 102 V. 123 V. 152 VIII. 612 VIII. 568 VIII. 155 V. 254 I. 150 VIII. 299 VII. 134 VII. 322 .IV. 380, 382 IX. 39 VIII. 593 VIII. 594 X. 447 Gwynne pumps.. .VII. 598, 67 66 HAGUE, C. A., mechanical correctness.. comparison between different types of engines...... HALL, A. F., method of arranging and indexing drawings and pat- disc., large blue prints. Hall's condenser... Hall steam and flue-gas engine... HALSEY, FREDK. A., a new rock drill....... I. 239 II. 287 II. 369 IX. 699 IX. 417 VII. 691 VI. 71 Hammering, effects of, on steel.... HAMMOND, G. W., disc., the unexpected which often happens. HAND, S. A., disc., Bower-Barff process.. VII. 242, 260 PAGE Hawkins's steam and flue-gas engine... HAYWARD, H. S., adjustable cut-off for marine engines. VII. 692 IV. 136 Heating and ventilating an office building, H. S. Snell. Heating by steam (184-3). 66 of air...... IX. 473 IX. 99 "the "Superior". Heating apparatus, automatic regulator for, J. T. Hawkins.. Heating surface in ventilating flues, W. P. Trowbridge Heavy hammers for steel...... Hecker Bros.' experiments on non-conducting linings. springs, J. W. Cloud... HEMINWAY, F. F., disc., cams for engine valves. IX. 431 VI. 857 VII. 825 III. 67 II. 114 VII. 268 VII. 378 VIII. 357 V. 173 VII. 784 HENNEY, J. B., disc., steel car axles... HENNING, G. C., apparatus used in testing materials. HENTHORN, J. T., power required to overcome the frictional resist- HEWITT, WM., a novel hammer-head and die. continuous rod mill of Trenton Iron Co... V. 369 IV. 286 VIII. 140 II. 116 VIII. 174 VI. 461 VII. 143 VIII. 399 VIII. 306 VIII. 295 VI. 77 II. 70 IX. 671 .IV. 380, 383 IV. 363 IX. 147 IX. 47 High-speed engines.... High-priced labor, capital's need for, W. E. Partridge.. VIII. 269 II. 75 VIII. 253 VIII. 126 VIII. 315 HILL, WM., the crystallization of wrought-iron. HIMROD, D., aeration of steel...... VIII. 141 II. 113 VII. 241. VI. 67 History and development of winding and pumping machine, of Penn., |