A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers
A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers
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In our eReader you can find the full English version of the book. Read A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers 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 A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers
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The spirit-level attached to the telescope must be parallel to the line of collimation. The clips (c, c) which retain the telescope in its Y's (as the cylindrical rings on which it rests are called) being opened, and the vertical arc clamped, bring the bubble to the centre of its " run " by means of the tangent screw (N) of the vertical arc. This done, carefully turn the telescope end for end in its Y's, so as not to disturb the vertical arc; if the bubble resumes its position in the centre of ...its run, the adjust- ment is correct; but if not, then it must be brought back one half of the distance it has moved by means of the screw at one end of tJte level (Z], and the other half by the tangent screw of the arc (N). This operation must be repeated until the adjustment is perfect.
Third adjustment. The axis of the instrument must be truly vertical, or what amounts to the same thing, the horizontal limb must be truly horizontal.
Set the instrument as nearly level as possible by the eye. Clamp the graduated circle (by />), but let the vernier circle be free.
What to read after A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers?
You can find similar books in the "Read Also" column, or choose other free books by J L Robinson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The spirit-level attached to the telescope must be parallel to the line of collimation. The clips (c, c) which retain the telescope in its Y's (as the cylindrical rings on which it rests are called) being opened, and the vertical arc clamped, bring the bubble to the centre of its " run " by means of the tangent screw (N) of the vertical arc. This done, carefully turn the telescope end for end in its Y's, so as not to disturb the vertical arc; if the bubble resumes its position in the centre of ...its run, the adjust- ment is correct; but if not, then it must be brought back one half of the distance it has moved by means of the screw at one end of tJte level (Z], and the other half by the tangent screw of the arc (N). This operation must be repeated until the adjustment is perfect.
Third adjustment. The axis of the instrument must be truly vertical, or what amounts to the same thing, the horizontal limb must be truly horizontal.
Set the instrument as nearly level as possible by the eye. Clamp the graduated circle (by />), but let the vernier circle be free.
What to read after A Treatise On Marine Surveying Prepared for the Use of Younger Naval Officers?
You can find similar books in the "Read Also" column, or choose other free books by J L Robinson to read onlineMoreLess
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