An Introduction to Practical Astronomy ...: Descriptions of the various instruments, that have been usefully employed in determining the places of heavenly bodies, with an account of the methods of adjusting and using them

Voorkant
author, 1829
 

Geselecteerde pagina's

Inhoudsopgave

DIOPTRIC MICROME 1 Has one of the four Lenses divided 2 First used as a coming
12
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
STANDS FOR ACHROMA 1 Heavy Telescopes require Stands 2 Specimen of a plain
19
DIAGONAL EYEPIECES 1 Their Use explained 2 Construction for a Change of Eye
21
Trial in different Positions of a Thick Prism 21 Careful
23
THE CONSTRUCTION
46
HERSCHELIAN TELE 1 The Stand simplified 2 Platform and Ladders forming
79
ON THE VERNIER
96
SPIDERSLINE MICRO 1 Different Micrometers 2 Spidersline Micrometer described
109
OTHER METHODS OF 1 Without the Sun 2 By a zodiacal Star 3 By the Differ
115
ON THE DIFFERENT 1 Reflector at the Object End of a Telescope 2 Reflector
122
CIRCULAR AND ANNU 1 Circular Field of the Telescope 2 Used by La Caille
144
3037
153
SMEATONS METHOD 1 Preparation 2 Trial of Saturns Distance from y Capric 3
164
THE DIVIDED EYE 1 Dynameter adapted for a Micrometrical Eyepiece 2
192
THE CUNEIFORM 1 Glass Wedges reversed and sliding at the Eyeend of the
199
3742
223
XIII
240
3
246
EXPERIMENTAL COM 1 Three good Telescopes of different Focal Lengths chosen
262
ON CLAMPS AND TAN 1 Appendages necessary for regulating slow Motions and sus
272
Subdivides a Circular Scale of equal Parts 2 Values of
278
ON THE SPIRITLEVEL
287
THE WESTBURY AL 1 Circles for Count Bruhl and Mr Pond 2 The Vertical Axis
441
ON THE USES OF A 1 The Portable Instrument has Verniers instead of Reading
457
A NEW PORTABLE AL 1 The Plan original 2 Stand and Circles described 3
464
THE GREENWICH MU 1 Constructed on a new Principle by Troughton 2 The Mea
472
NEW REPEATING CIR 1 Both the Altitude and the Azimuth Circles repeat separately
509
REPEATING TRIPOD 1 Will convert a portable Theodolite into a Repeating horizontal
515
OF THE EQUATORIAL IN by variable gravity and by refraction of the Atmosphere
524
GRAHAMS ZENITH 1 The Nature Invention and Use of a Zenith Sector 2
531
RAMSDENS ZENITH 1 Made for the general Survey as a portable Instrument 2
541
ZENITH MICROME 1 Is of recent invention the Greenwich Instrument the first 2
549
POLAR INSTRU 1 Described as a fixed Instrument revolving round the Polar
558
LXXXVI
564
ter in appearance but is differently constructed being also
571
Chiefly a nautical Instrument 2 The Principle of Reflection
581
XC
593
TO DETERMINE THE 1 Lunar Motion illustrated 2 Old Method of determining
603
XCV
620
AN ACCOUNT OF THE 1 The Board of Longitude dissolved 2 Terrestrial Methods
621
Explanation of the Method 2 Formulæ 3 Rules for com
641
THE THIRD METHOD 1 This Method has the Elements given from the Tables 2
652
DETERMINING THE LONGI
654
ON THE APPLICATION OF 1 Necessary when great precision is required in the Moons Place
700
SCIII AN ALPHABETICAL This List contains six Columns 1 The Places 2 The
705

Veelvoorkomende woorden en zinsdelen

aberration absolute brightness achromatic adjustment altitude angle aperture appear applied astronomer azimuth brass celestial eye-piece centre circle circular clamp clock computed construction contrivance convex lens correct crown glass declination determined diagonal diameter diaphragm disc distinct vision Ditto divided Dollond dome double stars dynameter elevation equal equatorial error eye-end eye-lens fast feet field of view figure fixed focal distance focus formed frame give given glass Gregorian telescope horizontal inches instrument large speculum lenses light magnifying power main tube means measure meridian metal method micrometer Newtonian telescope object object-glass observations pair parallel piece planet plate polar axis position prism pulleys quadrant quantity rack rays refracting telescope respective reticle revolutions right ascension ring round scale screw seen semi-lenses sliding slow motion small speculum solar focal length speculum metal spherical aberration Table terrestrial tion transit-instrument turned vernier vertical wire zero

Bibliografische gegevens

TitelAn Introduction to Practical Astronomy ...: Descriptions of the various instruments, that have been usefully employed in determining the places of heavenly bodies, with an account of the methods of adjusting and using them
Volume 2 van An Introduction to Practical Astronomy, William Pearson
AuteurWilliam Pearson
Uitgeverauthor, 1829
Oorspronkelijk uitUniversity of Minnesota
Gedigitaliseerd4 aug 2014
  
Citatie exporterenBiBTeX EndNote RefMan