Engineering:Seesaw searchlight
Seesaw searchlights were an early electric powered searchlight first developed in the 1870s used in conjunction with coast artillery.
The searchlight consisted of an electric carbon lamp, capable of a strong beam for target illumination. Because the bulb was vulnerable to enemy fire, it was protected in a recessed emplacement whilst a large mirror, attached to the end of a 'see-saw' pivoting iron beam reflected the beam across the water to the target. The light was powered by steam engines usually housed in the nearby forts.[1]
Only a few of these were built anywhere in the British Empire, and were difficult to operate and were never successful. New Zealand's example had been abandoned by 1899.[2][3]
Surviving examples
No complete examples have survived but concrete emplacements can still be found at:
- Fort Ballance, Wellington, New Zealand[4]
- Fort Victoria, Isle of Wight
- Warden Point Battery on the Isle of Wight[5]
See also
- Military applications of searchlight
- Canal Defence Light
- Turbinlite
- Leigh light
- G-numbers
- German searchlights of World War II
References
- ↑ "Military Heap Type Report Final Draft". Isle of Wight County Archaeology and Historic Environment Service Apr 2010. http://www.iwhistory.org.uk/resourceassessment/MilitaryHeapTypeReport.pdf.
- ↑ Glackin, Russell (2009). In Defence of our land. Penguin. p. 51. ISBN 9780143011866.
- ↑ Cooke, Peter (2000). Defending New Zealand : ramparts on the sea 1840-1950s. p. 51. ISBN 0473068338.
- ↑ "HISTORICAL ASPECT OF WELLINGTON'S MILITARY STRUCTURES". http://capitaldefence.freewebhost.co.nz/remgon/hstprv1.htm.
- ↑ "Fortifications Of The Isle of Wight – West Wight: Warden Point Battery". 10 August 2011. http://h2g2.com/entry/A86685781.
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