the pneumatic air pipes are used. For commencement of the next block in advance. To save (1843), and by Heis in Atlas Celestis Novus (1872), and night work powerful white lanterns are arranged on wire a ground circuit is used as the return. Thus, have thus become classic. It isa matter of congratu-… … ————q@q@“oe—_— compressed air are depended on as the agents THE large mortars now being made for the for the working of an automatic system, fail- ures in their action are to be anticipated. In the pre- sent system, should electricity or pneumatic action fail, end of the semaphore. the signals…
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