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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
To Silver and Polish Glass Specula.
The cost of silvering is trifling, and with cleanliness and ordinary care, very little difficulty will be experienced in the operation. The apparatus and chemicals required consist of the following articles :—
APPARATUS.
A Silvering Vessel.—This should be a circular porcelain or glass dish, i inch or more larger in diameter than the speculum to be silvered, and sufficiently deep to allow of about half-an-inch stratum of fluid between the face of the mirror and the bottom of the dish, which should be flat.
A Box of Scales and Weights.
A Glass funnel and filtering paper.
Two Glass Rods for stirring.
A Five-ounce Glass Measure.
A 20-oz. Glass Flask, and a 40-oz. ditto.
A Retort Stand for supporting the same.
A Spirit Lamp.
A Sand Bath.
A test tube, ^ or i-inch in diameter.
Some clean Cotton Wool.
A piece of very fine Wash-leather.
A support of Wood, on which to cement the Speculum, described further on.
A Mixing Vessel.—The larger flask will answer well, or a 40-oz. glass measure, which will also prove useful for other purposes. The mixing vessel should always be transparent, in order that the action o', the ammonia can be easily seen. If a flask be used the mixture can be shaken; if a measure, it may be stirred, but care must be taken not to touch the glass with the point of the rod, as it may scratch, and cause a crack.
D
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 98,91 %.
La langue de reconnaissance de l'OCR est l'Anglais.
The cost of silvering is trifling, and with cleanliness and ordinary care, very little difficulty will be experienced in the operation. The apparatus and chemicals required consist of the following articles :—
APPARATUS.
A Silvering Vessel.—This should be a circular porcelain or glass dish, i inch or more larger in diameter than the speculum to be silvered, and sufficiently deep to allow of about half-an-inch stratum of fluid between the face of the mirror and the bottom of the dish, which should be flat.
A Box of Scales and Weights.
A Glass funnel and filtering paper.
Two Glass Rods for stirring.
A Five-ounce Glass Measure.
A 20-oz. Glass Flask, and a 40-oz. ditto.
A Retort Stand for supporting the same.
A Spirit Lamp.
A Sand Bath.
A test tube, ^ or i-inch in diameter.
Some clean Cotton Wool.
A piece of very fine Wash-leather.
A support of Wood, on which to cement the Speculum, described further on.
A Mixing Vessel.—The larger flask will answer well, or a 40-oz. glass measure, which will also prove useful for other purposes. The mixing vessel should always be transparent, in order that the action o', the ammonia can be easily seen. If a flask be used the mixture can be shaken; if a measure, it may be stirred, but care must be taken not to touch the glass with the point of the rod, as it may scratch, and cause a crack.
D
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 98,91 %.
La langue de reconnaissance de l'OCR est l'Anglais.