A Treatise on Mathematical Instruments, Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling, in Practical Astronomy, and for Measuring the Angles of Crystals: In which Their Construction, and the Methods of Testing, Adjusting, and Using Them, are Concisely Explained
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accuracy adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp coincide colatitude compasses construction correction cosec cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal extent will reach eye-piece feet figure focal length given number goniometer half horizontal inches index glass instru instrument intersection latitude lens lenses limb line of chords line of collimation line of numbers line of sines logarithmic marked means measured meridian microscope number of degrees object object-glass observed paper parallax parallel plate pass perpendicular placed plane position primary divisions prism proportional protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right ascension round secants sector sextant side slider sliding speculum spherical aberration spirit level square station subdivisions taken tangents telescope theodolite transverse distance triangle tube turning vernier scale vertical circle zero