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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Page
... Beam Compasses Plotting Scales Pantagraph Coggeshall's Sliding Rule Management of Drawing Paper , & c . General Rules in Geometrical Construction PART II . ON OPTICAL INSTRUMENTS . Page 7 8 14 25 33 33 42 45 47 48 50 50 55 64 66 Prism ...
... Beam Compasses Plotting Scales Pantagraph Coggeshall's Sliding Rule Management of Drawing Paper , & c . General Rules in Geometrical Construction PART II . ON OPTICAL INSTRUMENTS . Page 7 8 14 25 33 33 42 45 47 48 50 50 55 64 66 Prism ...
Page 1
... Beam compasses . Plotting scales . The pantagraph . Sliding Rule . ON DRAWING COMPASSES . This instrument consists of two legs moveable about a joint , so that the ... Compasses -Hair Compasses -Compasses with Movable Points -Bow Compasses.
... Beam compasses . Plotting scales . The pantagraph . Sliding Rule . ON DRAWING COMPASSES . This instrument consists of two legs moveable about a joint , so that the ... Compasses -Hair Compasses -Compasses with Movable Points -Bow Compasses.
Page 14
... compasses upon c , and transfer the di- visions in the quadrant c D to the right line c D , and we shall have a ... beam compasses hereafter described , and corrected by the aid of a good Bird's vernier scale . and drawing right lines ...
... compasses upon c , and transfer the di- visions in the quadrant c D to the right line c D , and we shall have a ... beam compasses hereafter described , and corrected by the aid of a good Bird's vernier scale . and drawing right lines ...
Page 26
... beam compasses ( p . 48 ) , by which it is to be divided , bisect it , and figure it 1 at the commencement on the left hand , 1 again in the middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 ...
... beam compasses ( p . 48 ) , by which it is to be divided , bisect it , and figure it 1 at the commencement on the left hand , 1 again in the middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 ...
Page 27
... beam compasses , as explained in the construction of the line of numbers ; 1st , for every 10 degrees , then for every degree , and then for every half degree , every 10 minutes , and every 5 minutes , as far as the length of the ...
... beam compasses , as explained in the construction of the line of numbers ; 1st , for every 10 degrees , then for every degree , and then for every half degree , every 10 minutes , and every 5 minutes , as far as the length of the ...
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