nd were only actually TTTNNELINe BT FBEEZING. flaws can be detected before it is applied to practical broken in one spot. Of course, all running of trains Poetsch's ingenious system of sinking mine shafts use. It will be much less through watery earth by exposed to injury from at- freezing the… … time. Cast iron sleepers Lindmark, of the Swedish Fig. l.-TUNNELING BY FREEZING. are expected to withstand Engineers, proposed to a similar test up to 7 feet tunnel the hill. The total only.' The cost of glass sleepers will be considerably less length of the work is 755 feet, the width is 13 feet…
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