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Product images of Cust demonstrating his Patent Rangefinder, circa 1904
Product details Cust demonstrating his Patent Rangefinder, circa 1904
Cust demonstrating his Patent Rangefinder, circa 1904
Cust's Patent Rangefinder (Museum object NAV1581) was designed to be mounted on an Officer of the Watch telescope or on a monocular. It works from knowing the height of a masthead, funnel or other feature of a ship, with the distance measured from the angle subtended by that feature. When placed in front of the telescope, two prisms in the rangefinder produce a double image, which is altered by revolving the front prism. When the double image is resolved into a single one, the angle is read off the graduated scale, which has a vernier allowing it to be read to an accuracy of 10 minutes. The angle can then be converted into a height using a slide rule that was supplied with the rangefinder. This example is inscribed with the name of the manufacturer and with its patent number (no. 15221). It is contained in a leather carrying case.
- Image ref: L3734-003
- National Maritime Museum