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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
95
ASTRONOMICAL EYE PIECES.
Page 58.
HUYGHENIAN CONSTRUCTION.
Of the following magnifying powers on a 6-feet focus object-glass.
50, 90, 160, 250 370, 500
£ »• ° 15 1 I
120
250
500
60, 120, 250 ...
30, 60, and 80...
RAMSDEN’S CONSTRUCTION. With Achromatic Lenses.
APLANATIC CONSTRUCTION.
KELLNER’S CONSTRUCTION.
Erecting Day Eye-piece, page 13 ... Pancratic ,,
Barlow’s Lens, page 5
Adjusting Piece for Reflectors, page 25
Thomthwaite’s Binocular Eyepiece...
£ s. d.
... ... 1 0 0
1 7 6
1 12 6
£ s. d.
... each 1 10 0
£ s. d.
... each 1 10 0
to order.
£ s. d.
1 5 0
1 12 6
... 1 1 0
0 2 6
10 io 0
SOLAR EYE PIECES.
Page 59.
Silvered Barlow’s Lens
Solar Diagonal ... .......................................
Dawes’ Solar Eye-piece Levander’s Diaphragm Eye-piece ...
Coloured Eye-piece Cap for observing the Moon... ... ........
Neutral Tint and Smoke-coloured Wedges, for use on the Sun, Moon, and Planets
Other varieties of Solar eye-pieces to order.
£ s. d.
I 10 o I 12 6 800.
3 3°
050 I 10
MICROMETERS.
Page 60.
Parallel Wire Micrometer .................
Position Micrometers...
Double Image Micrometer........
Illuminating Apparatus ...................
Extra Ramsden’s Eye-pieces Berthon’s Dynamometer (page 61)...
Ditto, mounted with eye-piece
... 5 50 £8 8 o to 15 15 o ...880 from 2 10 o „ o 15 6
.... 076
... 1 10
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 91,69 %.
La langue de reconnaissance de l'OCR est l'Anglais.
ASTRONOMICAL EYE PIECES.
Page 58.
HUYGHENIAN CONSTRUCTION.
Of the following magnifying powers on a 6-feet focus object-glass.
50, 90, 160, 250 370, 500
£ »• ° 15 1 I
120
250
500
60, 120, 250 ...
30, 60, and 80...
RAMSDEN’S CONSTRUCTION. With Achromatic Lenses.
APLANATIC CONSTRUCTION.
KELLNER’S CONSTRUCTION.
Erecting Day Eye-piece, page 13 ... Pancratic ,,
Barlow’s Lens, page 5
Adjusting Piece for Reflectors, page 25
Thomthwaite’s Binocular Eyepiece...
£ s. d.
... ... 1 0 0
1 7 6
1 12 6
£ s. d.
... each 1 10 0
£ s. d.
... each 1 10 0
to order.
£ s. d.
1 5 0
1 12 6
... 1 1 0
0 2 6
10 io 0
SOLAR EYE PIECES.
Page 59.
Silvered Barlow’s Lens
Solar Diagonal ... .......................................
Dawes’ Solar Eye-piece Levander’s Diaphragm Eye-piece ...
Coloured Eye-piece Cap for observing the Moon... ... ........
Neutral Tint and Smoke-coloured Wedges, for use on the Sun, Moon, and Planets
Other varieties of Solar eye-pieces to order.
£ s. d.
I 10 o I 12 6 800.
3 3°
050 I 10
MICROMETERS.
Page 60.
Parallel Wire Micrometer .................
Position Micrometers...
Double Image Micrometer........
Illuminating Apparatus ...................
Extra Ramsden’s Eye-pieces Berthon’s Dynamometer (page 61)...
Ditto, mounted with eye-piece
... 5 50 £8 8 o to 15 15 o ...880 from 2 10 o „ o 15 6
.... 076
... 1 10
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 91,69 %.
La langue de reconnaissance de l'OCR est l'Anglais.