nscriptions an angle iron bolted to the web of the rail, and is held up to the present to ascertain the stability of tracks of each of them at once, but only one is actuated by by a wire in order to assure of an interdependence of have been made, in faet, with immovable loads, and the tube of the… … keeps the lever arm con- it is their ever repeated ac- tinually in contact with tion that wears the track the button of theexplorer. and produces permanent distortions in it. They, therefore, lead to considerable | With the apparatus just described, Mr. Couard has ob- cylinder that constitutes the…
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