Elements of Physical Manipulation, Part 1Hurd & Houghton, 1873 |
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Page 19
... a millimetre less than the divisions of the scale , as in Ex periment 2 . One of the best devices for measuring very minute quantities is the micrometer screw . A divided circle is attached to MEASUREMENT OF WEIGHT . 19.
... a millimetre less than the divisions of the scale , as in Ex periment 2 . One of the best devices for measuring very minute quantities is the micrometer screw . A divided circle is attached to MEASUREMENT OF WEIGHT . 19.
Page 20
Edward Charles Pickering. the micrometer screw . A divided circle is attached to the head of a carefully made screw , so that a large motion of the former cor- responds to a very minute motion of the latter . Thus if the pitch of the screw ...
Edward Charles Pickering. the micrometer screw . A divided circle is attached to the head of a carefully made screw , so that a large motion of the former cor- responds to a very minute motion of the latter . Thus if the pitch of the screw ...
Page 21
... screw he has constructed . To measure very minute distances a microscope is often used with a scale inserted in its eyepiece , which is used like a common rule . The absolute size of the divisions must be determined be- forehand by ...
... screw he has constructed . To measure very minute distances a microscope is often used with a scale inserted in its eyepiece , which is used like a common rule . The absolute size of the divisions must be determined be- forehand by ...
Page 24
... screw . Both methods are really only means of copy- ing an originally divided circle , as it is called , and the con- struction of this with accuracy is a matter of extreme difficulty . It is dependent on the following principles . Any ...
... screw . Both methods are really only means of copy- ing an originally divided circle , as it is called , and the con- struction of this with accuracy is a matter of extreme difficulty . It is dependent on the following principles . Any ...
Page 25
... screw at the centre of a tripod , whose three legs and central point are brought in contact with the surface . By noting the position of the screw , the radius is readily computed , as in Experiment 14 . When the surface is of glass ...
... screw at the centre of a tripod , whose three legs and central point are brought in contact with the surface . By noting the position of the screw , the radius is readily computed , as in Experiment 14 . When the surface is of glass ...
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Common terms and phrases
abscissas accuracy accurate amount angle of incidence angular aperture aperture Apparatus attached axis barometer beam brass Canada balsam centre coincide color column compute construct contour lines cross-hairs crystal curve determined diameter distance divided draw equal equation error Experiment eye-piece focus friction gives graduated circle hole horizontal hydrometer inches index of refraction instrument intervals latter length lens lenses liquid marked measure mercury meter method micrometer microscope millimetre minute mirror moving nearly Nicol's prism object observations obtained opthalmoscope paper parallel pass piece placed plane of polarization plate of glass polariscope polarized light position pressure reading reflected refraction remove rendered residual curve retina right angles scale scale-pan screw side slide slit specific gravity spherometer surface telescope temperature tenths tube turn varying velocity vernier vertical vibrations visible volume wave-length weight wire