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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
*3
ACHROMATIC TELESCOPES,
With Erecting Eye Pieces. Page 12.
Naval Telescopes, with cylindrical or taper bodies covered with leather, single or double draws, sun and spray shades, £1, Pi 10s., £2 2s., £3 is., £4 4s., £5 5s., £6 6s., £7 7s., £8 8s.
Naval Telescope, Admiralty pattern, with 2£ object glass, fitted in a leather covered taper body, leather caps and slings, nickel plated fittings and focussing draw tube. £3 15s.
Military Telescopes. Double draw in cases, £1 11s. 6d., ^3 3s., £4 4s. The smallest size will show a bullet mark at 1,000 yards.
Military Target Telescope. Pancratic eye piece, focussed by rack and draw, on portable tripod stand, with registering board affixed, in case complete, £9 10s.
Any of the above telescopes are suitable for deer stalking or similar purposes, but Horne & Thornthwaite manufacture a special telescope, with micrometer eye-piece, by means of which the exact distance of the object aimed at can be ascertained, and the rifle sighted accordingly. This telescope is also very suitable for military purposes, £7 5s.
Fig- 35-
Tourists’ Telescopes (Fig. 35). These telescopes are made in several draws, so as to close up into a small case ; all the tubes, &c. are made as light as possible, so as to ensure portability. The smallest size will show bullet marks at 800 yards, and distinguish objects at a distance of 8 miles. 10s. 6d., ,£1 is., ,£1 10s., £2 2s., £2 12s. 6d.
The Alpine Telescope. This Telescope, although weighing only four ounces, is capable of showing bullet marks at 800 yards, and windows in houses 8 miles distant. Its extreme portability recommends it strongly to the Alpine Tourist, enabling him to observe, even when travelling on railroads or steamboats, objects in the landscape with perfect ease. This telescope has been thoroughly tested by an experienced Swiss traveller, and found to fulfil all the requirements needed, with such portability as to still further recommend it. £1 is.
HORNE AND THORNTHWAITE’S BINOCULAR TELESCOPES.
This instrument consists of a pair of precisely similar telescopes, placed side by side at a distance adjustable, by means of a screw, to the width between the observer’s eyes A second screw focusses both eyepieces. Though this binocular is not much larger than a field glass, its power is much greater. Price in sling case, ,£8 8s. Larger sizes, ^10 ios., ,£15 15s. In Aluminium, ^16 ios., ^18 10s., ,£24.
Mahogany Stands for any of the above ,£i 18s. to £2 ios.
Telescope Clip to fasten to window frame 17s. 6d. to £2 2s.
Universal Joint to fasten into a tree 12s. 6d. to ^1 is.
F Z
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 96,34 %.
La langue de reconnaissance de l'OCR est l'Anglais.
ACHROMATIC TELESCOPES,
With Erecting Eye Pieces. Page 12.
Naval Telescopes, with cylindrical or taper bodies covered with leather, single or double draws, sun and spray shades, £1, Pi 10s., £2 2s., £3 is., £4 4s., £5 5s., £6 6s., £7 7s., £8 8s.
Naval Telescope, Admiralty pattern, with 2£ object glass, fitted in a leather covered taper body, leather caps and slings, nickel plated fittings and focussing draw tube. £3 15s.
Military Telescopes. Double draw in cases, £1 11s. 6d., ^3 3s., £4 4s. The smallest size will show a bullet mark at 1,000 yards.
Military Target Telescope. Pancratic eye piece, focussed by rack and draw, on portable tripod stand, with registering board affixed, in case complete, £9 10s.
Any of the above telescopes are suitable for deer stalking or similar purposes, but Horne & Thornthwaite manufacture a special telescope, with micrometer eye-piece, by means of which the exact distance of the object aimed at can be ascertained, and the rifle sighted accordingly. This telescope is also very suitable for military purposes, £7 5s.
Fig- 35-
Tourists’ Telescopes (Fig. 35). These telescopes are made in several draws, so as to close up into a small case ; all the tubes, &c. are made as light as possible, so as to ensure portability. The smallest size will show bullet marks at 800 yards, and distinguish objects at a distance of 8 miles. 10s. 6d., ,£1 is., ,£1 10s., £2 2s., £2 12s. 6d.
The Alpine Telescope. This Telescope, although weighing only four ounces, is capable of showing bullet marks at 800 yards, and windows in houses 8 miles distant. Its extreme portability recommends it strongly to the Alpine Tourist, enabling him to observe, even when travelling on railroads or steamboats, objects in the landscape with perfect ease. This telescope has been thoroughly tested by an experienced Swiss traveller, and found to fulfil all the requirements needed, with such portability as to still further recommend it. £1 is.
HORNE AND THORNTHWAITE’S BINOCULAR TELESCOPES.
This instrument consists of a pair of precisely similar telescopes, placed side by side at a distance adjustable, by means of a screw, to the width between the observer’s eyes A second screw focusses both eyepieces. Though this binocular is not much larger than a field glass, its power is much greater. Price in sling case, ,£8 8s. Larger sizes, ^10 ios., ,£15 15s. In Aluminium, ^16 ios., ^18 10s., ,£24.
Mahogany Stands for any of the above ,£i 18s. to £2 ios.
Telescope Clip to fasten to window frame 17s. 6d. to £2 2s.
Universal Joint to fasten into a tree 12s. 6d. to ^1 is.
F Z
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 96,34 %.
La langue de reconnaissance de l'OCR est l'Anglais.



