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 Concisley ExplainedJ. Weale, 1856 - 170 pages |
From inside the book
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... Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 - Solar Microscope Camera Obscura Lucida Telescopes , Refracting Reflecting Adjusted and Tested • 81 · 84 86 88 89 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain 92.
... Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 - Solar Microscope Camera Obscura Lucida Telescopes , Refracting Reflecting Adjusted and Tested • 81 · 84 86 88 89 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain 92.
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... Chain 92 Off - setting Staff 95 Spirit Level 96 Y Level 97 Levelling Staff 104 Troughton's Level 104 Gravatt's 105 Levelling , Remarks on . 106 Water Level Reflecting Level Prismatic Compass Box Sextant Artificial Horizon Theodolite ...
... Chain 92 Off - setting Staff 95 Spirit Level 96 Y Level 97 Levelling Staff 104 Troughton's Level 104 Gravatt's 105 Levelling , Remarks on . 106 Water Level Reflecting Level Prismatic Compass Box Sextant Artificial Horizon Theodolite ...
Page 9
... chain , or one foot , & c . , the primary divisions will be so many tens of miles , or of chains , or of feet , & c .; if the subdivisions are taken as tens , the primary divisions will be hundreds ; and , if the primary divisions be ...
... chain , or one foot , & c . , the primary divisions will be so many tens of miles , or of chains , or of feet , & c .; if the subdivisions are taken as tens , the primary divisions will be hundreds ; and , if the primary divisions be ...
Page 38
... chains ; the transverse distance at 47 , or the seventh principal subdivi- sion after the primary division marked 4 , will represent 4 chains 70 links , and so on . To construct a Scale of Feet and Inches in such a manner that an extent ...
... chains ; the transverse distance at 47 , or the seventh principal subdivi- sion after the primary division marked 4 , will represent 4 chains 70 links , and so on . To construct a Scale of Feet and Inches in such a manner that an extent ...
Page 48
... chains , 80 of which occupied a length equal to six inches , which , therefore , represented one mile , six inches to the mile being the scale to which that important survey 48 MATHEMATICAL INSTRUMENTS . Beam Compasses.
... chains , 80 of which occupied a length equal to six inches , which , therefore , represented one mile , six inches to the mile being the scale to which that important survey 48 MATHEMATICAL INSTRUMENTS . Beam Compasses.
Other editions - View all
A Treatise On Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2022 |
A Treatise on Mathematical Instruments: Including Most of the Instruments ... John F Heather No preview available - 2016 |
Common terms and phrases
accuracy adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp coincide colatitude compasses construction correction cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure focal length given number goniometer 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 protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right ascension round secants sector sextant side sixth column slider sliding speculum spherical aberration spirit level square station strument subdivisions tangents telescope theodolite transverse distance triangle tube turning vernier scale vertical circle zero