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

author, 1829

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Deviations to which the Instrument is liable and Notation	1

REDUCTION OF THE 1 The Readings depend on the figuring of the Graduations	2

BINOCULAR SPIDERS 1 Difficulty of viewing at two Distances avoided by bringing	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 1 Two kinds 2 Smeatons 3 Dome on Balls Openings 911	9

ON THE USE OF PO 1 A Graduated Circle added 2 Remarks on the Use 3	10

DIOPTRIC MICROME 1 Has one of the four Lenses divided 2 First used as a coming	12

ON THE PLUMBLINE 1 Its Use in adjusting an Axis to a vertical Position 2 When	285

ON THE PROPERTIES 1 A good Refracting Telescope moves in the Plane of the Meri	315

DIRECTIONS FOR THE 1 Parts to be carefully examined 2 Adjustment of the Levels	321

TO DETERMINE THE 1 Three Methods of finally adjusting an Approximate Mark	328

THE MOSCOW TRANSIT The Mechanism supported by Pillars 2 The Weight relieved	362

ON THE METHODS OF 1 All Transitinstruments used in the same manner 2 Method	371

RAMSDENS ALTITUDE 1 The Palermo Instrument 2 The vertical Axis has Metallic	422

THE WESTBURY AL 1 Circles for Count Bruhl and Mr Pond 2 The Vertical Axis	444

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 1 Their Use explained 2 Construction for a Change of Eye	21

EQUATORIAL OR PARAL 1 Equatorial Motion very useful 2 Smeatons Block 3 Stand	42

HERSCHELIAN TELE 1 The Stand simplified 2 Platform and Ladders forming	79

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 1	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 1 Circular Field of the Telescope 2 Used by La Caille	144

SMEATONS METHOD 1 Preparation 2 Trial of Saturns Distance from y Capric 3	160

DOUBLE IMAGE MICROMETERS	166

THE DIVIDED EYE 1 Dynameter adapted for a Micrometrical Eyepiece 2	192

of Measure 15 Single and Double Image Micrometers	249

EXPERIMENTAL COM 1 Three good Telescopes of different Focal Lengths chosen	257

ON CLAMPS AND TAN 1 Appendages necessary for regulating slow Motions and sus	272

Principle further illustrated 6 Different Verniers may	278

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

EQUATORIAL IN 1 A Polar Axis used by Scheiner in 1620 2 Shorts reflecting	517

GRAHAMS ZENITH 1 The Nature Invention and Use of a Zenith Sector 2	531

DR MASKELYNES 1 Two contiguous Prisms reversed in position 2 Experimental	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

LI ON ARTIFICIAL HORI 1 A Reflecting Plane gives a double Altitude 2 Horizontal	596

TO DETERMINE THE 1 Lunar Motion illustrated 2 Old Method of determining	603

ON THE OCCULTA 1 Previous Remarks 2 The first Method of computing Occul	631

THE SECOND METHOD 1 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

ON THE APPLICATION OF 1 Necessary when great precision is required in the Moons Place	700

AN ALPHABETICAL This List contains six Columns 1 The Places 2 The	705

Titel	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 Volume 2 van An Introduction to Practical Astronomy, William Pearson Volume 2 van An Introduction to Practical Astronomy: Containing Tables, Recently Computed, for Facilitating the Reduction of Celestial Observations; and a Popular Explanation of Their Construction and Use, William Pearson
Auteur	William Pearson
Uitgever	author, 1829
Oorspronkelijk uit	University of Minnesota
Gedigitaliseerd	4 aug 2014

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