SPERTI Astro Compass D500 MK II WW2 In Case Good - Solar Survey
Item History & Price
| Reference Number: Avaluer:50052060 | Region of Origin: United States |
| Original/Reproduction: Original | Theme: Militaria |
| Conflict: WW II (1939-45) |
SPERTI Astro Compass D500 MK IIWith Tripod Mount
World War 2 Vintage
In Bakelite Case
Good Working Condition
These units were used by the Army Air Corps for navigation over polar regions, where regular magnetic compasses were unusable.
In good working condition.
These units are used today to study solar access on a site:
"The Astro-compass can be used to trace the paths of astronomical bodies across the sky vault. The sky vault is an i...maginary dome around any position on the Earth, with the horizon as the base of the dome and the zenith overhead. The Astro-compass replicates the physical relationship of the Earth's surface to the sun, and is adjustable for location on Earth (latitude), time of year (Earth's declination), and time of day (hour angle). Looking over the sight plates of the Astro-compass and turning the hour wheel allows you to trace the path of the sun across the sky for a given location and season. The Astro-compass can also be used as a transit to measure the angular height of all horizon obstructions in order to generate a horizon shading mask for a site. A shading mask can be overlaid on an equidistant sun-path diagram to provide a year-round chart of solar access for a specific location."
Shipped fast with tracking, packed and padded well.
World War 2 Vintage
In Bakelite Case
Good Working Condition
These units were used by the Army Air Corps for navigation over polar regions, where regular magnetic compasses were unusable.
In good working condition.
These units are used today to study solar access on a site:
"The Astro-compass can be used to trace the paths of astronomical bodies across the sky vault. The sky vault is an i...maginary dome around any position on the Earth, with the horizon as the base of the dome and the zenith overhead. The Astro-compass replicates the physical relationship of the Earth's surface to the sun, and is adjustable for location on Earth (latitude), time of year (Earth's declination), and time of day (hour angle). Looking over the sight plates of the Astro-compass and turning the hour wheel allows you to trace the path of the sun across the sky for a given location and season. The Astro-compass can also be used as a transit to measure the angular height of all horizon obstructions in order to generate a horizon shading mask for a site. A shading mask can be overlaid on an equidistant sun-path diagram to provide a year-round chart of solar access for a specific location."
Shipped fast with tracking, packed and padded well.
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