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 12
Page 15
... line c D , and we shall have a scale of chords * . From the divisions in the quadrant CD , draw right lines parallel to Do , to cut the radius o c , and , numbering the divi- sions from o , towards c , we shall have a scale of sines ...
... line c D , and we shall have a scale of chords * . From the divisions in the quadrant CD , draw right lines parallel to Do , to cut the radius o c , and , numbering the divi- sions from o , towards c , we shall have a scale of sines ...
Page 17
John Fry HEATHER. From the point D , draw right lines through the divisions upon the line of sines o c , to meet the circumference B c , and transferring these divisions from B , as a center to the chord BC , we shall have the corresponding ...
John Fry HEATHER. From the point D , draw right lines through the divisions upon the line of sines o c , to meet the circumference B c , and transferring these divisions from B , as a center to the chord BC , we shall have the corresponding ...
Page 18
... chords describe an arc cutting AB in B ; then on the line of rhumbs take the extent to the third subdivision beyond ... line A c on a chart , draw meridian A B , describe arc B C with radius equal to chord of 60 ° , as before , and the ...
... chords describe an arc cutting AB in B ; then on the line of rhumbs take the extent to the third subdivision beyond ... line A c on a chart , draw meridian A B , describe arc B C with radius equal to chord of 60 ° , as before , and the ...
Page 26
... line of chords , always placed on the same dialling scale , take the extent of 60 ° , and describe from the center a the arc gn ; then with the extent of the latitude of the place , suppose Lon- don , 5140 , taken from the same line of ...
... line of chords , always placed on the same dialling scale , take the extent of 60 ° , and describe from the center a the arc gn ; then with the extent of the latitude of the place , suppose Lon- don , 5140 , taken from the same line of ...
Page 35
... line of sines , and this extent will reach from 145 to 250 upon the line of numbers ..A B = 250 THE PLANE SCALE ... chords , and these consequently are all the lines placed on many of the instruments in the pocket cases ; but for ...
... line of sines , and this extent will reach from 145 to 250 upon the line of numbers ..A B = 250 THE PLANE SCALE ... chords , and these consequently are all the lines placed on many of the instruments in the pocket cases ; but for ...
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