Mark I
Prince Louis of Battenberg employed a firm of London instrument makers to build a prototype to his design. The device comprised:
- 2 position bars for setting the initial and final stations
- A speed bar, on which the speed of the ship (relative to the flagship) was set, and which was clamped at one end into the diameter grove by the speed ratio clamp
- A guide bar
- A circular disc
To use the instrument, the course of the flagship was first set on the guide bar. When the initial and final stations had been set using the position bars, the speed ratio clamp was set to show the ratio of own ship speed to the speed of the flagship (if the flagship was doing 10 knots, and the manoeuvring ship had 15 knots available, the clamp would be set to "1.5"). Ensuring that the pin beneath the speed ratio clamp was set within the diameter grove, the course required to take station could then be read off the circular disc.
Read more about this topic: Battenberg Course Indicator
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