A Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing, and Use Concisely Explained |
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Page 8
... divisions from the plotting scale and protractor ( p . 33 ) . This point may ... divided nsist of an " To draw a straight line between two points upon a plane ... primary d if the pri bdivisions W The accom of the sim enerally plac dapt ...
... divisions from the plotting scale and protractor ( p . 33 ) . This point may ... divided nsist of an " To draw a straight line between two points upon a plane ... primary d if the pri bdivisions W The accom of the sim enerally plac dapt ...
Page 9
... division on the left hand . The first of these primary divisions is sub- divided into ten equal parts , and from these last divisions the scale is named . Thus it is called a scale of 30 , when 30 of these small parts are equal to one ...
... division on the left hand . The first of these primary divisions is sub- divided into ten equal parts , and from these last divisions the scale is named . Thus it is called a scale of 30 , when 30 of these small parts are equal to one ...
Page 10
... primary division numbered 6 , to the 7th upper subdivision , reckoning back wards , as before . Diagonal Scales . - In the simply - divided scales one of the primary divisions is subdivided only into ten equal parts , and the parts of ...
... primary division numbered 6 , to the 7th upper subdivision , reckoning back wards , as before . Diagonal Scales . - In the simply - divided scales one of the primary divisions is subdivided only into ten equal parts , and the parts of ...
Page 11
... 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 highest or first parallel in each of these scales to accord with 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 highest or first parallel in each of these scales to accord with the ...
Page 12
... primary division , and it will reach beyond the beginning of this division , or zero point , a distance equal to one of the sub- divisions . Now divide the extent thus set off into ten equal parts , marking the divisions on the opposite ...
... primary division , and it will reach beyond the beginning of this division , or zero point , a distance equal to one of the sub- divisions . Now divide the extent thus set off into ten equal parts , marking the divisions on the opposite ...
Common terms and phrases
accuracy achromatic adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp cloth boards coincide compasses construction correct cross wires described distinct vision divided drawing edge Edition ENGINEERING equal error extent will reach eye-piece feet figure fixed focal length given number graduated half HENRY LAW horizontal Illustrated inches instru instrument intersection latitude lens lenses limb line of collimation line of numbers line of sines logarithmic means measured ment meridian microscope object object-glass observed paper parallax pass perpendicular placed plane position primary divisions prism protractor quarter girt radius RALPH TATE rays reading reflector refracting refracting telescopes represent right angles right ascension round screw secants sextant side slider sliding speculum spherical aberration spirit level square station subdivisions survey tangents telescope theodolite tion transverse distance triangle tube turning vernier scale vertical circle Woodcuts zero
Popular passages
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