308
The Gula Lighthouse, situated at Longitude East 113°35,' Latitude North 21°11.' is 52 1/2 feet (13.3 m) high. Its light, originally lit by paraffin as an unclassed light, was modernised in 1910 by the installation of a group-flashing apparatus of the Third Order which can be seen for 20 miles in clear weather.
On 20th March 1875.
Cape D'Aguilar is at Latitude 22°12' 14" N. Longitude 114°15' 44" E.
10 T. Roger Banister (1932). The Coastwise Lights of China, Shanghai: Inspectorate General of Customs, Statistical Department, p. xiii.
An example provided by the Encyclopaedia Britannica, 1957, Vol.14, p. 88 shows that a lighthouse of 200 ft. in elevation is visible at a distance of 16.22 nautical miles. It can be seen by an observer at an elevation of 30 ft., which by itself has a visible distance of 6.28 nautical miles, within 16.22 + 6.28 = 22.50 nautical miles.
12 CO129/166 pp.351-357 Letter from Earl of Kimberley to Hong Kong Governor Arthur Kennedy, 11 July 1873.
13 The corporation of Trinity House is said to have developed from the Trinity Guild formed by Archbishop S. Langton in the 13th century. The Guild owned a hall and alms-houses at Deptford for the benefit of seamen and their families. It also checked the pillaging of wrecked ships on the English coast. Trinity House, located at a place overlooking Trinity Square in London, has been the headquarters of the Lighthouse Service in U.K. since 1796. At present it owns 72 Lighthouses, 13 Major Floating Aids, 18 Beacons, 429 Buoys, 48 Radar Beacons and 7 DGPS Reference Stations. http://www.trinityhouse.co.uk/
14 CO129/172 pp.17-22. 1974/06/03
15 CO129/172 pp.17-22. 1974/06/03
16 HKGG, 12 June, 1875. P. 242.
17 CO129/167 pp.124-128.
18 Sessional Papers of 1901.