An Introduction to Practical Astronomy: Volume 2: Containing Descriptions of the Various Instruments that Have Been Usefully Employed in Determining the Places of the Heavenly BodiesAlthough astronomical guides were available in the early nineteenth century, they tended to come from continental presses and were rarely in English. This two-volume work by the clergyman and astronomer William Pearson (1767-1847) aimed, with brilliant success, to compile data from extant sources into one of the first English practical guides to astronomy. Most of the tables were updated and improved versions, and some were wholly reconstructed to streamline the calculation processes. Sir John Herschel dubbed it 'one of the most important and extensive works on that subject which has ever issued from the press', and for his efforts Pearson was awarded the gold medal of the Astronomical Society. First published in 1829, Volume 2 provides full descriptions of a range of astronomical instruments, alongside instructions for their use and some pertinent equations and tables. In the history of science, Pearson's work reflects the contemporary challenges of celestial study. |
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Índice
Circular Field of the Telescope | 1 |
ON THE CORRECTION 1 Fundamental Star with an assumed Right Ascension | 2 |
XLI DR BREWSTERS PA 1 Has two second moveable Objectglasses one entire and | 3 |
DOLLONDS IMPROVED 1 Description 2 Remedy for a Defect 3 The Scale | 4 |
ERECT EYEPIECES 1 Terrestrial Eyepiece 2 A Compound Microscope 3 Con | 6 |
ROTATIVE DOME | 9 |
XLIV ON THE USE OF PO 1 A Graduated Circle added 2 Remarks on the Use 3 | 10 |
LXXIV REPEATING CIRCLE 1 The Principle of Repetition first suggested by Mayer 2 Borda | 11 |
ON THE PLUMBLINE 1 Its Use in adjusting an Axis to a vertical P0siti0n 2 When | 285 |
ON ARTIFICIAL HORI LI 1 A Reflecting Plane gives a double Altitude 2 Horizontal | 294 |
LIV ON THE PROPERTIES | 310 |
LV A PORTABLE TRANSIT | 317 |
TO DETERMINE | 326 |
XLV EXPERIMENTAL COM 1 Three good Telescopes of different Focal Lengths chosen | 332 |
LVIII ON THE ERRORS | 337 |
THE MOSCOW TRANSIT I The Mechanism supported by Pillars 2 The Weight relieved | 362 |
g xv | 12 |
XCIX ON SOLAR ECLIPSES 1 The Circumstances attending a Solar Eclipse 2 The first | 15 |
ON THE DIFFERENT 1 Definition of the Constant Angle 2 Four Methods of Deter | 16 |
DIAGONAL EYEPIECES | 21 |
A POPULAR EXPLANA l Achromatic Principle 2 So namedby Dr Bevis 3 Disper | 30 |
STANDS FOR ACHROMA 1 Heavy Telescopes require Stands 2 Specimen of a plain | 37 |
THE CONSTRUCTION AND 1 Method of determining the Magnifying Power by the Focal | 46 |
SPIDERSLINE MICRO 1 Diflerent Micrometers 2 Spidersline Micrometer described | 48 |
THE DORPAT REFRACT I Fraunhofers Chef daeuvre 2 The Framework 3 | 55 |
xvr HERSCHELIAN ETELE | 79 |
XVIII AN HISTORICAL | 89 |
OTHER METHODS | 110 |
XXL MICROMETRICAL SCALE | 120 |
A NEW POLYMETRIC | 130 |
XXXIV RAMSDENS CATOP 1 Principle of Reflection proposed 2 Its advantage 3 | 194 |
ZENITH SECTOR BY 1 Has a descending Axis and is more portable than its Prede | 212 |
XXIII | 224 |
1221 | 228 |
steeds Sector and mural Arch 19 Grahams mural Qua | 268 |
ON THE METHODS OF 1 All Transitinstruments used in the same manner 2 Method | 371 |
63? 71 | 378 |
AN ALPHABETICAL This List contains six Columns 1 The Places 2 The | 383 |
RAMSDENS ALTITUDE l The Palermo Instrument 2 The vertical Axis has Metallic | 422 |
LXVII THE WESTBURY AL 1 Circles for Count Bruhl and Mr Pond 2 The Vertical Axis | 444 |
LXX ON THE USES OF A l The Portable Instrument has Verniers instead of Reading | 457 |
NEW REPEATING CIR 1 Both the Altitude and the Azimuth Circles repeat separately | 509 |
REPEATING TRIPOD l Will convert a portable Theodolite into a Repeating horizontal | 515 |
EQUATORIAL IN l A Polar Axis used by Scheiner in 1620 2 Shorts reflecting | 524 |
LXXXIL ZENITH MICROME 1 Is of recent invention the Greenwich Instrument the first 2 | 549 |
POLAR INSTRU l Described as a fixed Instrument revolving round the Polar | 558 |
Reflector at the Object End of a Telescope | 569 |
LXXXIX TROUGHTONS RE The Authors Reasons for preferring a Circle without the | 596 |
2123 | 657 |
LXXL A NEW PORTABLE AL I The Plan original 2 Stand and Circles described 3 | 665 |
TO DETERMINE THE l The Angle at the Equinox variable 2 An Example for de | 702 |
2326 | 703 |
CONCLUSION I The rapid Improvements in Practical Astronomy 2 Owing | 707 |
Términos y frases comunes
achromatic adjustment altitude aperture apparent applied astronomer axis azimuth brass celestial centre circle circular clamp clock collimation computed construction contrivance convex lens correction crown glass declination determined diameter disc Ditto divided double double stars dynameter equatorial error eye-end eye-piece fast field of view fig figure find first five fixed focal distance focal length focus formula frame give given glass Greenwich horary angle horizontal inches instrument latitude lens lenses limb longitude magnifying power means measure meridian method micrometer microscopes moon’s motion Nautical Almanac object object-glass observations pair parallax parallel piece pivots plane plate plumb-line polar distance position prism quadrant quantity rays reduced reflecting refracting telescope refraction respective right ascension round scale screw seen sextant side solar focal spherical aberrations star star’s sufficiently sun’s Table telescope telescope’s tion transit-instrument tube vernier vertical wire zenith distance zero