A Treatise on Practical Astronomy: As Applied to Geodesy and Navigation |
From inside the book
Results 1-5 of 43
Page vii
... CLOCK . The vernier .... The reading microscope - The micrometer . Eccentricity of graduated circles ...... The sextant .... The prismatic sextant .. Adjustments of the sextant .. Method of observing .... Index error ..... Eccentricity ...
... CLOCK . The vernier .... The reading microscope - The micrometer . Eccentricity of graduated circles ...... The sextant .... The prismatic sextant .. Adjustments of the sextant .. Method of observing .... Index error ..... Eccentricity ...
Page 2
... clock reading . When such errors are large they are not likely to give much trouble , as their true nature appears at once . When they are small they may prove embarrassing . The present discussion does not apply to them , and we shall ...
... clock reading . When such errors are large they are not likely to give much trouble , as their true nature appears at once . When they are small they may prove embarrassing . The present discussion does not apply to them , and we shall ...
Page 174
... CLOCK . 96. The circles of astronomical instruments are graduated continuously from zero to 360 ° . With ordinary field - instru- ments the smallest division is commonly 10 ' , though sometimes less . The large circles of fixed ...
... CLOCK . 96. The circles of astronomical instruments are graduated continuously from zero to 360 ° . With ordinary field - instru- ments the smallest division is commonly 10 ' , though sometimes less . The large circles of fixed ...
Page 209
... clock , it may be done very conveniently by means of the chronograph . * The clock being connected with the chronograph , the observer taps the signal - key in coincidence with one or more even beats of the chronometer , and thus the ...
... clock , it may be done very conveniently by means of the chronograph . * The clock being connected with the chronograph , the observer taps the signal - key in coincidence with one or more even beats of the chronometer , and thus the ...
Page 210
... clock depends upon the length of the pendulum ; and since a rod of metal changes its length with every change of temperature , some method of compensation is necessary in order to keep the centre of oscillation at a constant distance ...
... clock depends upon the length of the pendulum ; and since a rod of metal changes its length with every change of temperature , some method of compensation is necessary in order to keep the centre of oscillation at a constant distance ...
Contents
1 | |
7 | |
13 | |
20 | |
26 | |
32 | |
41 | |
47 | |
54 | |
65 | |
71 | |
78 | |
84 | |
92 | |
99 | |
107 | |
114 | |
120 | |
127 | |
149 | |
155 | |
162 | |
168 | |
174 | |
180 | |
186 | |
194 | |
207 | |
215 | |
222 | |
229 | |
247 | |
257 | |
265 | |
276 | |
283 | |
388 | |
398 | |
413 | |
423 | |
435 | |
443 | |
460 | |
474 | |
481 | |
487 | |
493 | |
501 | |
507 | |
519 | |
525 | |
535 | |
542 | |
552 | |
558 | |
564 | |
575 | |
583 | |
590 | |
598 | |
609 | |
617 | |
623 | |
Other editions - View all
Common terms and phrases
accuracy altitude angle applied approximation arithmetical mean ascension and declination axis azimuth Bessel catalogue celestial sphere centre chronograph chronometer circle circumpolar stars clamp co-ordinates coefficients collimation computation constant convenient culmination determined difference differential dt dt earth east ecliptic elongation emersion ephemeris equal example follows formulæ geocentric given gives Greenwich horizon hour-angle instant latitude limb logarithms longitude mean solar measured meridian method micrometer middle thread moon moon's right ascension multiplied Nautical Almanac obtained occultation parallax plane position prime vertical probable error proper motion reading reduced refraction right ascension screw semidiameter sextant sidereal sin² star's stars observed Substituting subtract telescope tion transit instrument unknown quantities values vernier weight write zenith distance ΙΟ
Popular passages
Page 645 - ... Nutrition 8vo, 4 oo Budd and Hansen's American Horticultural Manual: Part I. Propagation, Culture, and Improvement I2mo, i 50 Part II. Systematic Pomology I2mo...