the same time as the main tunnel, that we need tem that can be employed not only for the loading of coal, only consider here a'length of ten milesof excavation worked but also for letting down to the bottom of the hold bricks, from one face. stones, salt, etc. Practical trials in chalk made with… … IMPROVED ELEVATORS FOR LOADING SHIPS WITH COAL BALLAST, ETC. maintained of one yard per hour, or twenty-four yards per two figures may be seen how it operates when the loading nearly to the base of the bucket frame, is provided with a day, at which rate the work of excavating ten miles of tun-…
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