d against of forming an eye in one end of a human hair and thread- exceeded by the introduction of automatic machinery. ing'it with the other is no doubt familiar to all. the possibly rough edge of the eye, these latter are gone over The shafts now undergo a process of straightening, and The idea… … Fig. 0.—CEMENTING. burnishing machine, in which the needles are ing the shafts at both ends. Grindstones of on a steel wire to which rapid revolution is imparted, was machine employed is shown in Fig. 4, and will be readily fine-grained sandstone are used with this view, rotating by introduced two…
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