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Picture of Freiberger drum sextant - half view mirror

Manufacturer: Freiberger

Freiberger drum sextant - half view mirror

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SKU: 832.10855051726

The traditional instrument for celestial position finding in sea.
Comfortable weight and size with excellent balance from it's well designed light metal alloy frame.
Large horizon and index mirrors which are tested for optical flatness and parallelism.
The clamping device and micrometer drum are fully enclosed for protection against dirt and water spray.
Standard telescope 4x40 is adjustable for height and fitted with a protective rubbers eyepiece.
The correct amount of brightness through the sextants optical light paths is controlled by means of swing in graded filters 4 for the index and 3 for the horizon mirrors.
Option:
Illumination device which is detachable (battery operated)
8 x 30 monocular telescope
Can be supplied as a surveying sextant (for horizontal sights) and fitted whith a detachable penta prism to extend the measuring range to 215 degrees.
wooden haldle, halfview mirror, black

Technical data

Graduated arc
radius 170 mm
scale of degrees -5° to 125°
interval 1°
Drum graduations
interval 1'
visual interval 0,1'
Telescope
lens aperture 40 mm
magnification 4 x
Variation
Handle - Plastic
- Hardwood
Colour - black
- grey or blue
Dimensions
drum sextant 26x24x13cm
carrying case 34x322x17cm
Weight
drum sextant 1,4 kg
carrying case 4,5 kg

Remarks:
There are two types of horizon mirrors to determine celestial altitudes:

- Half-view mirror and
- Full-view mirror.

There is only one half silvered of the half-view mirror. Two images appear in the telescope. The whole mirror of the full-view mirror is silvered. The image is not divided and heavenly body and horizon line are in one image.
When determining sunsets, it is necessary to apply glass shades for sun protection.

The traditional instrument for celestial position finding in sea.
Comfortable weight and size with excellent balance from it's well designed light metal alloy frame.
Large horizon and index mirrors which are tested for optical flatness and parallelism.
The clamping device and micrometer drum are fully enclosed for protection against dirt and water spray.
Standard telescope 4x40 is adjustable for height and fitted with a protective rubbers eyepiece.
The correct amount of brightness through the sextants optical light paths is controlled by means of swing in graded filters 4 for the index and 3 for the horizon mirrors.
Option:
Illumination device which is detachable (battery operated)
8 x 30 monocular telescope
Can be supplied as a surveying sextant (for horizontal sights) and fitted whith a detachable penta prism to extend the measuring range to 215 degrees.
wooden haldle, halfview mirror, black

Technical data

Graduated arc
radius 170 mm
scale of degrees -5° to 125°
interval 1°
Drum graduations
interval 1'
visual interval 0,1'
Telescope
lens aperture 40 mm
magnification 4 x
Variation
Handle - Plastic
- Hardwood
Colour - black
- grey or blue
Dimensions
drum sextant 26x24x13cm
carrying case 34x322x17cm
Weight
drum sextant 1,4 kg
carrying case 4,5 kg

Remarks:
There are two types of horizon mirrors to determine celestial altitudes:

- Half-view mirror and
- Full-view mirror.

There is only one half silvered of the half-view mirror. Two images appear in the telescope. The whole mirror of the full-view mirror is silvered. The image is not divided and heavenly body and horizon line are in one image.
When determining sunsets, it is necessary to apply glass shades for sun protection.

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