Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
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Page
... 67 Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 Telescopes , Refracting 81 Reflecting Solar Microscope 84 Adjusted and Tested 86 88 Camera Obscura • Lucida 89 . 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain Off.
... 67 Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 Telescopes , Refracting 81 Reflecting Solar Microscope 84 Adjusted and Tested 86 88 Camera Obscura • Lucida 89 . 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain Off.
Page 7
... plane of the instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two points of the ...
... plane of the instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two points of the ...
Page 8
... plane , we lay a rule so that the straight edge thereof may just pass by the two points ; then moving a fine - pointed needle , or drawing - pen , along this edge , we draw a line from one point to the other , which , for common ...
... plane , we lay a rule so that the straight edge thereof may just pass by the two points ; then moving a fine - pointed needle , or drawing - pen , along this edge , we draw a line from one point to the other , which , for common ...
Page 11
... plane scale of six inches in length . In one , the distances between the primary divisions are each half an inch , and in the other a quarter of an inch . The parallel next to the figures numbering these divisions must be considered the ...
... plane scale of six inches in length . In one , the distances between the primary divisions are each half an inch , and in the other a quarter of an inch . The parallel next to the figures numbering these divisions must be considered the ...
Page 17
... plane upon which the circles are to be delineated is called the primitive , and the circumference of a circle , de- scribed with a radius , representing , upon the reduced scale of the drawing , the radius of the sphere , is called the ...
... plane upon which the circles are to be delineated is called the primitive , and the circumference of a circle , de- scribed with a radius , representing , upon the reduced scale of the drawing , the radius of the sphere , is called the ...
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Treatise on Mathematical Instruments: Their Construction, Adjustment ... John Fry Heather No preview available - 2016 |
Common terms and phrases
accuracy achromatic adjustment altitude axis azimuth beam compasses bisected breadth bubble called chromatic dispersion clamp coincide colatitude compasses construction correct cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure fixed focal length given number goniometer graduated half horizontal inches index glass instru instrument intersection IVY LANE latitude lens lenses limb line of collimation line of numbers line of sines logarithmic means measured ment meridian microscope number of degrees object-glass observed paper parallax perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right angles right ascension round secants sector sextant side Slide Rule sliding speculum spherical aberration spirit level square staff station subdivisions tangents telescope theodolite transit transverse distance triangle tube turning vernier scale vertical circle zero
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