SILVA MARK IV PRISMATIC MILITARY COMPASS

SILVA MARK IV PRISMATIC MILITARY COMPASS™
WELCOME TO E.J. MOTIWALLA. YOUR ONLINE SURVEYING ASSISTANCE.
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Capsule Liquid-filled. Freezing point of liquid below -70°C. | Scale: Graduated in 0-6400 mils in 20 mil increments on the precision scale.
Dial of heat resistant plastics. Dial centre of anodised aluminium. | Sapphire jewel bearing. | Brass pivot, with hard metal tip. Pivot mounted on metal bridge. | Magnet: Strong sintered magnet, settling time about 8-9 seconds from 90° deflection to rest position. | Tilting angle of card +-12°. | Accuracy: night pin +-0.3°, hairline on compass lid +-0.5° frictional error less than 0.25°. | Direct reading scale on the index ring against the compass reading +-2°. | Temperature range: -30°C - +50°C. | Housing: light-weight heavy-duty polycarbonate material.
Prism: Glass prism of highest quality. Prism slide and lid of heavy-duty polycarbonate. | Finger loop in brass. | Index ring of glass.
Lid window of glass. | Index line in the lid glass is etched to withstand daily use without disappearing. | Compass housing delivered with a military-green shock-absorbing coating. | Pressurizing: the compass will stand bubble-free under all normal conditions. The capsule itself is internally pressurized for use at altitudes up to 1000 meters and externally pressurized with a pressurizing spring to keep compass bubble-free up to 4000 meters altitude. | Illumination: by Tritium light sources which are self powered and have a useful life of about 10-12 years.
Illumination is placed on the dial at the 64 (6400-North) marking, on the capsule bottom for illumination of the prismatic bearing and the night pin, on the white ring for illuminating the direct reading bearing and on the lid at the sight. | Case in simulated leather with leather sling and belt loop.

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