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
... Reading Microscope The Collimator · PART V. The Common Goniometer Wollaston's Goniometer ON GONIOMETERS . APPENDIX INDEX 137 141 144 144 151 153 160 182 164 165 168 183 A TREATISE ON MATHEMATICAL INSTRUMENTS . PART I. - ON CONTENTS .
... Reading Microscope The Collimator · PART V. The Common Goniometer Wollaston's Goniometer ON GONIOMETERS . APPENDIX INDEX 137 141 144 144 151 153 160 182 164 165 168 183 A TREATISE ON MATHEMATICAL INSTRUMENTS . PART I. - ON CONTENTS .
Page 45
... be equal to the nth part of a division upon the limb . With this arrangement , however , we should have the inconvenience of reading the vernier backwards . In fig . 1 , six divisions of the vernier THE VERNIER 45 Vernier.
... be equal to the nth part of a division upon the limb . With this arrangement , however , we should have the inconvenience of reading the vernier backwards . In fig . 1 , six divisions of the vernier THE VERNIER 45 Vernier.
Page 46
... reading off we must first look to the lozenge , as point ing out the exact place upon the limb at which the required measurement is indicated . If , then , the stroke upon the vernier at the lozenge exactly coincides with a stroke upon ...
... reading off we must first look to the lozenge , as point ing out the exact place upon the limb at which the required measurement is indicated . If , then , the stroke upon the vernier at the lozenge exactly coincides with a stroke upon ...
Page 48
... reading of the instrument would be 22 ° 44 ′ 40 ′′ . Similarly , by means of a micrometer divided into ten equal parts , a distance to the thousandth part of an inch may be read off by the vernier in fig . 2. If the micrometer in this ...
... reading of the instrument would be 22 ° 44 ′ 40 ′′ . Similarly , by means of a micrometer divided into ten equal parts , a distance to the thousandth part of an inch may be read off by the vernier in fig . 2. If the micrometer in this ...
Page 49
... reading plates , b , c , each fixed at the side of an opening in the brass boxes to which they are attached , and affording the means of minutely subdividing the principal divisions , aa , on the beam , which appear through those ...
... reading plates , b , c , each fixed at the side of an opening in the brass boxes to which they are attached , and affording the means of minutely subdividing the principal divisions , aa , on the beam , which appear through those ...
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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