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As zinc is one of the metals most readily attacked by acids, ordinary galvanized iron is not suitable for positions where it is to be much exposed to an atmosphere charged with acids sent into the air by some manufactories, or to the sulphuric acid fumes found in the products of combustion of rolling mills, iron, glass, and gas works, etc., and yet we see engineers of note covering-in important buildings with corrugated and other sheets of iron, and using galvanized iron tie rods, angles, and other constructive shapes in blind confidence of the protective power of the zinc coating; also in supreme indifference as to the future consequences and catastrophes that arise from their unexpected failure.
In occupations the very steps of the process were spiritualized: thus, for example, in the prayer for the husbandman there was invoked the spirit of fallowing, of ploughing, of furrowing, sowing, covering-in, harrowing, and so forth down to that of the in-bringing, up-storing, and opening of the granaries.
The use of oval or egg-shaped sewers will rarely be necessary under the circumstances that we are considering; but there may be exceptional conditions where the covering-in of a brook, or storm-water course, cannot be avoided; and in such cases the volume of water may vary so greatly that there will at times be a mere thread of a stream, and at times a torrent.
This covering-in is accomplished by means of a framework of timber having slat-work or panel sides and tops in fact, by enclosing their orchards in a huge elaborate bush-house, which is further protected by the heat produced by six large heating stoves or salamanders to each acre of trees enclosed.
In occupations the very steps of the process were spiritualized: thus, for example, in the prayer for the husbandman there was invoked the spirit of fallowing, of ploughing, of furrowing, sowing, covering-in, harrowing, and so forth down to that of the in-bringing, up-storing, and opening of the granaries.
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