St.) is fastened on to the middle of the drum membrane; the third, ventral or infracolumellar process (i.
The planks were of wood, often beech, a few inches wide, and were fastened down, end to end, on logs of wood, or " sleepers," placed crosswise at intervals of two or three feet.
Each length was thus fastened to a sleeper at one end, while at the other it was socketed into the end of its fellow.
This method, however, was not found satisfactory: the projecting feet were liable to be broken off, and in 1799 or 1800 Jessop abandoned them, using instead separate cast-iron sockets or chairs, which were fastened to the sleepers and in which the rails were supported in an upright position.
Long and weighed 35 lb to the yard, and they were fastened by iron wedges to chairs weighing 15 or 17 lb each.