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- TABLE DES MATIÈRES
- TABLE DES ILLUSTRATIONS
- RECHERCHE DANS LE DOCUMENT
- TEXTE OCÉRISÉ
- Première image
- PAGE DE TITRE
- Preface to the third edition (p.R2)
- Contents (p.R3)
- Introduction (p.5)
- The various forms of telescopes. Their construction and advantages (p.7)
- Refracting telescopes (p.11)
- Stands for indirect-vision reflectors (p.31)
- Equatorial adjustments (p.41)
- To silver and polish glass specula (p.49)
- Apparatus (p.49)
- To support the Mirror in the Silvering Vessel (p.50)
- To clean the mirror (p.51)
- To immerse the mirror (p.51)
- To prepare the Silvered surface for polishing (p.52)
- To polish the Silvered surface (p.53)
- To separete the Mirror from the Wooden Support (p.54)
- Martin's process of silvering (p.54)
- Dr. Henry Draper's formula for silvering (p.56)
- The sugar of milk process for silvering (p.56)
- General, hints on silvering (p.57)
- Accessories to the telescope (p.58)
- Observatories (p.66)
- Defining and separating tests (p.78)
- Light tests (p.79)
- Catalogue of reflecting and retracting telescops and their accessories (p.81)
- Achromatic perspective glasses (p.81)
- Achromatic opera glasses (p.81)
- Achromatic field glasses (p.81)
- Achromatic telescopes (p.83)
- Horne and thornthwaite's binocular telescopes (p.83)
- Refracting telescopes for astronomical purposes (p.84)
- Astronomical object glasses (p.87)
- Astronomical reflecting telescopes (p.89)
- Silvered-glass specula (p.93)
- Silvered-glass diagonal mirrors (p.93)
- The “romsey” observatory (p.93)
- Silvering and polishing specula (p.94)
- Apparatus for silvering (p.94)
- Set of silvering apparatus (p.94)
- Astronomical eye pieces (p.95)
- Solar eye pieces (p.95)
- Micrometers (p.95)
- Astronomical spectroscopes (p.96)
- Trabsit instruments (p.96)
- Works on astronomy (p.96)
- Dernière image
- Première image
- PAGE DE TITRE
- The german equatorial stand (p.17)
- The victoria equatorial (p.18)
- The alt-azimuth stand (p.32)
- Horne and Thornthwaite's equatorial reflector (p.34)
- Horne and Thornthwaite's portable equatorial reflector (p.35)
- The berthon equatorial (p.38)
- The berton equatorial (p.39)
- The victoria equatorial telescope (p.85)
- Berthon patent equatorial stand (p.90)
- The alt-azimuth stand (p.92)
- Binoclar microscope (p.97)
- Dernière image
96
ASTRONOMICAL SPECTROSCOPES.
Page 62.
£ s. d.
Home and Thornthwaite’s Miniature Universal Spectroscope ... ... 2 15 o
Star Spectroscopes ........................ £4, £8, £15, 20 o o
Solar Spectroscopes ....................... ^14, ^20, £26, 40 o o
TRANSIT INSTRUMENTS
On cast-iron stands, with fully divided circles, reading microscopes, three micrometic and one diagonal eye-pieces, complete in case :—
Tinch Object-glass, 15-inch focus, portable
14
2
2|
3
3 i
20
25
30
36
42
fixed
£ s. d.
. 20 0 0
. 22 10 0
• 25 0 0
• 38 0 0
. 60 0 0
• 67 0 0
instrument
Berthon’s Transit Instrument, ,£15, £20. In this the telescope is firmly fixed in a horizontal position at right angles to the meridian, a reflector revolving in the meridian exhibits transit stars in the telescope ; the illumination of the lines is effected on an entirely new principle allowing delicate observations to be most easily made.
Transit Eye-Pieces, for use with Equatorials, £\ is., £2 2s.
Dr. Royster Pigott’s Flashing Transit Eye-Piece, .£1 12s. 6d. and £2 5s. In this instrument a silvered disc, with lines cut through the film, is substituted for the spider threads ; as a star, therefore, passes the lines it flashes. The great advantage of this instrument is that artificial illumination of the lines is rendered unnecessary.
Horne & Thornthwaite’s Sidereal, or Mean Time Astronomical Clock (page 72), £20.
WORKS ON ASTRONOMY.
Page 77.
Proctor's Small Star Atlas ... ... ... ........
„ Half-hours with the Stars....... ..........
„ Half-hours with the Telescope ... ........
Webb’s Celestial Objects..........................
Chambers’ Descriptive Astronomy...................
050 050 026 076 1 8 o
HORNE & THORNTHWAITE,
Aprils 1878.
416, STRAND.
Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 94,23 %.
La langue de reconnaissance de l'OCR est l'Anglais.
ASTRONOMICAL SPECTROSCOPES.
Page 62.
£ s. d.
Home and Thornthwaite’s Miniature Universal Spectroscope ... ... 2 15 o
Star Spectroscopes ........................ £4, £8, £15, 20 o o
Solar Spectroscopes ....................... ^14, ^20, £26, 40 o o
TRANSIT INSTRUMENTS
On cast-iron stands, with fully divided circles, reading microscopes, three micrometic and one diagonal eye-pieces, complete in case :—
Tinch Object-glass, 15-inch focus, portable
14
2
2|
3
3 i
20
25
30
36
42
fixed
£ s. d.
. 20 0 0
. 22 10 0
• 25 0 0
• 38 0 0
. 60 0 0
• 67 0 0
instrument
Berthon’s Transit Instrument, ,£15, £20. In this the telescope is firmly fixed in a horizontal position at right angles to the meridian, a reflector revolving in the meridian exhibits transit stars in the telescope ; the illumination of the lines is effected on an entirely new principle allowing delicate observations to be most easily made.
Transit Eye-Pieces, for use with Equatorials, £\ is., £2 2s.
Dr. Royster Pigott’s Flashing Transit Eye-Piece, .£1 12s. 6d. and £2 5s. In this instrument a silvered disc, with lines cut through the film, is substituted for the spider threads ; as a star, therefore, passes the lines it flashes. The great advantage of this instrument is that artificial illumination of the lines is rendered unnecessary.
Horne & Thornthwaite’s Sidereal, or Mean Time Astronomical Clock (page 72), £20.
WORKS ON ASTRONOMY.
Page 77.
Proctor's Small Star Atlas ... ... ... ........
„ Half-hours with the Stars....... ..........
„ Half-hours with the Telescope ... ........
Webb’s Celestial Objects..........................
Chambers’ Descriptive Astronomy...................
050 050 026 076 1 8 o
HORNE & THORNTHWAITE,
Aprils 1878.
416, STRAND.
Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 94,23 %.
La langue de reconnaissance de l'OCR est l'Anglais.