# Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely Explained

Virtue Bros. & Company, 1866 - 185 sider

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### Innhold

 PART 1 Triangular Compasses 7 Protracting Scales 14 Gunters Lines 25 The Plain Scale 33 Marquoiss Scales 43 Plotting Scales 50 Coggeshalls Sliding Ku 55
 Land Chain 92 Levelling Staff 104 Water Level 112 113 Box Sextant 117 125 T Square and Semicircular Protractor 131 PART IV 137 The Dip Sector 144 Method of Observing with the Transit 151

### Populære avsnitt

Side 67 - ... that the sine of the angle of refraction bears a constant ratio to the sine of the angle of incidence...
Side 186 - Gd. 96. ASTRONOMY, by the Rev. R, Main. Is. 107. METROPOLITAN BUILDINGS ACT, and THE METROPOLITAN ACT FOR REGULATING THE SUPPLY OF GAS, with Notes, by D. Gibbons and R. Hesketh. 2s.
Side 90 - ... of this field of view. We must therefore place some fixed point in the field, of view, and in the focus of the eye-piece, and the point to which the measurement will have reference will be that point of the object viewed, which...
Side 185 - THE ENTIRE SERIES IS FREELY ILLUSTRATED ON WOOD AND STONE WHERE REQUISITE. The Public are respectfully informed that the whole of the late MB.
Side 24 - From the center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag i.
Side 135 - ... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In taking distances, when the position does not vary from the vertical above thirty or forty degrees, the handles which are attached to the circle are generally most conveniently used ; but in those which incline more to the horizontal, that handle which...