A Treatise of 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 CrystalsJohn Weale, 1849 - 183 pages |
From inside the book
Results 1-5 of 53
Page 4
... figures represent two constructions of pen bows , Fig . 1 being well adapted to describe arcs of not more than one inch radius , and Fig . 2 to describe arcs of small radii with exactness by means of the adjusting screw C. For copying ...
... figures represent two constructions of pen bows , Fig . 1 being well adapted to describe arcs of not more than one inch radius , and Fig . 2 to describe arcs of small radii with exactness by means of the adjusting screw C. For copying ...
Page 5
... figure the scale of lines is placed on the leg A E , on the left - hand side of the groove , and the scale of circles , on the same leg , on the right - hand side of the groove . The scales of plans and solids are on the other face of ...
... figure the scale of lines is placed on the leg A E , on the left - hand side of the groove , and the scale of circles , on the same leg , on the right - hand side of the groove . The scales of plans and solids are on the other face of ...
Page 7
... figure . a b c is a solid tripod , having at the extremity of the three arms three limbs , d , e , and f , moving freely upon centers by which they may be placed in any po- sition with respect to the tripod and each other . These limbs ...
... figure . a b c is a solid tripod , having at the extremity of the three arms three limbs , d , e , and f , moving freely upon centers by which they may be placed in any po- sition with respect to the tripod and each other . These limbs ...
Page 12
... figures upon a diagonal scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first . Vernier Scales . - The nature of these scales will be ...
... figures upon a diagonal scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first . Vernier Scales . - The nature of these scales will be ...
Page 13
... figure the distances between the primary divisions are each one inch , and , consequently , the distances be- tween the subdivisions are each one tenth of an inch , and the distances between the divisions of the vernier scale each one ...
... figure the distances between the primary divisions are each one inch , and , consequently , the distances be- tween the subdivisions are each one tenth of an inch , and the distances between the divisions of the vernier scale each one ...
Other editions - View all
A Treatise On Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2018 |
A Treatise on Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2015 |
A Treatise on Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2016 |
Common terms and phrases
accuracy achromatic 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 divided drawing edge extent will reach eye-piece feet figure focal length given number graduated Gunter's chain 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 ment meridian microscope number of degrees object object-glass observed paper parallax pass pencil of light perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting Refracting Telescope represent right ascension round secants sector sextant side slider sliding speculum spherical aberration spirit level square station strument subdivisions taken tangents telescope theodolite tion transverse distance tube turning vernier plate vernier scale vertical circle zero