our hours, or wells or by the construction of an expensive system of matter in warm climates, and alsoduring a few summer double that amount if used alone for cooling purposes. piping. The former plan was preferred, and two new months in the Northern States. These changes consist No motive power is… … (the continued friction and attrition which the results obtained by actually with the metal surface scouring off sinking wells amply justified, the quan- the dust, which is removed by the current of air), ready tity of water to be obtained being apparently inex- of the furnace, thus saving fuel,…
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