General Instructions for the Field Work of the U.S. Coast And Geodetic Survey ..
General Instructions for the Field Work of the U.S. Coast And Geodetic Survey ..
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In our eReader you can find the full English version of the book. Read General Instructions for the Field Work of the U.S. Coast And Geodetic Survey .. Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book General Instructions for the Field Work of the U.S. Coast And Geodetic Survey ..
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364. In case of emergency sextant glasses may be resilvered in the field by the following method : The necessary requisites are tin foil and mercury. Lay the tin foil, which should exceed the surface of the glass by a quarter of an inch on each side, on a Digitized by VjOOQIC HTDROORAPHT. 127 smooth pad of paper ; rub It smootii with the finger ; add a drop of mercury about tlie size of a small shot, which rub gently ov^r the tin foil until it spreads itself and shows a silvered surface ; gentl...y add sufficient mercury to cover the leaf, so that its surface is fluid. Prepare a slip of dean tissue paper the size of the tin foil. Brush the surface of the mercury gently to free it from dross. Take the glass, previously well cleaned, in the left hand and the paper in the right. Lay the ^aper on the mercury and the glass on it. Pressing gently on the glass withdraw the paper.
Turn the glas9 on its face and leave it on an inclined plane to allow the mercury to flow ofli which is accel«»ted by laying a strip of tin foil as a conductor to its lower edge.
What to read after General Instructions for the Field Work of the U.S. Coast And Geodetic Survey ..?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Coast And Geodetic Survey to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
364. In case of emergency sextant glasses may be resilvered in the field by the following method : The necessary requisites are tin foil and mercury. Lay the tin foil, which should exceed the surface of the glass by a quarter of an inch on each side, on a Digitized by VjOOQIC HTDROORAPHT. 127 smooth pad of paper ; rub It smootii with the finger ; add a drop of mercury about tlie size of a small shot, which rub gently ov^r the tin foil until it spreads itself and shows a silvered surface ; gentl...y add sufficient mercury to cover the leaf, so that its surface is fluid. Prepare a slip of dean tissue paper the size of the tin foil. Brush the surface of the mercury gently to free it from dross. Take the glass, previously well cleaned, in the left hand and the paper in the right. Lay the ^aper on the mercury and the glass on it. Pressing gently on the glass withdraw the paper.
Turn the glas9 on its face and leave it on an inclined plane to allow the mercury to flow ofli which is accel«»ted by laying a strip of tin foil as a conductor to its lower edge.
What to read after General Instructions for the Field Work of the U.S. Coast And Geodetic Survey ..?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Coast And Geodetic Survey to read onlineMoreLess
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