. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fig. 108. — Screw Spike used by Grand Duchy of Baden State Railways (1860).* Revue Generate des Chemins de Fer, July, 1884, and June, 1893. SUPPORTS OF THE RAILNORTHERN. Fig. 109. —Early French Screw Spikes (1863). TABLE XXVI. — FORCES NECESSARY FOR EXTRACTING BY SCREWSPIKES INCH AND INCH IN DIAMETER WITH THREADS OF PITCH, SUNK INCHES IN WOOD OF VARIOUS SPECIES ANDAGES (Jules Michel) Diameterof ScrewDate of
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fig. 108. — Screw Spike used by Grand Duchy of Baden State Railways (1860).* Revue Generate des Chemins de Fer, July, 1884, and June, 1893. SUPPORTS OF THE RAILNORTHERN. Fig. 109. —Early French Screw Spikes (1863). TABLE XXVI. — FORCES NECESSARY FOR EXTRACTING BY SCREWSPIKES INCH AND INCH IN DIAMETER WITH THREADS OF PITCH, SUNK INCHES IN WOOD OF VARIOUS SPECIES ANDAGES (Jules Michel) Diameterof ScrewDate of Pitch of Northern New Wood Currently Employed in Tracks 1875 5,733 9,48110,143 9,923 10,58411,576 12,84412,458 1881 July, 1884. 1889 Rolled screw spikes,24 trials. 1889 1889 1891 7,640 11,378 1889 13,010 12,348 Wood Having Been 9 Years in Track 10,14311,576 Fig. 110 shows a machine used on the Atchison, Topeka and Santa Fefor preparing ties for screw spikes. Wooden dowels as shown in Fig. Ill arescrewed into the ties.* Table XXVII gives the cost of equipping a mile of trackwith screw spikes, the estimate being based on work actually done on a sectionof track five miles in length
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