Page:EB1911 - Volume 16.djvu/671

From Wikisource
Jump to navigation Jump to search
This page has been proofread, but needs to be validated.
LIGHTHOUSE
649
Table VI.Electric Lighthouse Apparatus.
Name.  Characteristic.   Period.  Duration of Flash. Candle-
power (Service Intensity).
Focal Distance of Lens. Ratio of Angular Breadth of Panel to
Whole Circle.
 Current.   Voltage.   Carbons.   Electric Generators.   Lamps.   Engines.   Elevation above High Water.   Year Estab- lished. Remarks.
    Secs. Secs. Standard Candles. mm.   Amps.   mm.       Feet.    
United Kingdom                              
Souter Point
(Durham)
Single flash 30 5 Candle-
power
not
officially
deter-
mined.
500 1 : 8 .. 40 17 Holmes machines, alternating (400 revs.) Serrin Steam 150 1871 Fixed light apparatus, with revolving vertical condensing lenses in eight panels.
South Foreland
(Kent)
Single flash 2.5 .35 700 1 : 16 .. 40 26 do. Serrin Steam 374 1904 Lens elements only; 97° vertical angle. (This apparatus was in use at St Catherine’s, 1888 to 1904, and replaced the two fixed electric lights established in 1872.)
Lizard
(Cornwall)
Single flash 3 .13 700 1 : 4 145 for 50 mm. carbons 40 50 and 60 fluted De Meritens alternators (600 revs.) Modified Berjot-Serrin Oil engines 230 1903 Mercury rotation; vertical angle, 139°. Replaced the two fixed electric lights erected in 1878.
St Catherine’s
(Isle of Wight)
Single flash 5 .21 700 1 : 4 145 for 50 mm. carbons 40 50 and 60 fluted do. do. 2 Steam, each 50 h.p. 136 1904 Mercury rotation; vertical angle, 139°.
Isle of May
(Firth of Forth)
4 flash 30 .4 700 (Fixed apparatus) 1 : 8 220 40 40 do. Berjot-Serrin Steam 240 1886 Fixed light apparatus, with revolving vertical condensing lenses.
France
 Dunkerque
 (Strait of Dover)
2 flash 10 .2 to .4 3,500,000 to 6,500,000 300 1 : 12 30 and 60 45 14 and 18 2 De Meritens alternators, each of 5.5 k.w. (550 revs.) Improved Serrin 2 Semi-portable steam, each 30 i.h.p. 193 1902 Twelve panels in groups of two. (This apparatus was in use at Barfleur, 1893 to 1902.)
Calais
(Strait of Dover)
[Les Baleines (1882) similar]
4 flash 15 .75 900,000 300 1 : 24 60 45 18 do. French Service pattern (1902) do. 190 1883 Fixed light apparatus, with revolving vertical condensing prisms.
Cap Gris-nez
(Strait of Dover)
Single flash 5 .10 to .14 15,000,000 to 30,000,000 300 1 : 4 60 to 120 45 18 and 28 do. do. Steam 233 1899 Twin optic, mercury rotation. (This light superseded a triple-flashing electric light, with intermediate red flash, of the Calais type, established in 1885. The first installation of the electric light at this station was in 1869.)
La Canche
(Strait of Dover)
2 flash 10 .10 to .14 15,000,000 to 30,000,000 300 1 : 4 30 to 60 45 14 and 18 do. do. do. 174 1900 Twin optic, mercury rotation. (This light superseded a fixed electric light established in 1884.)
 Cap de la Hève
 (Havre, English Channel)
 [Île d’Yeu in the Bay of Biscay
 (1895) similar]
Single flash 5 .10 to .14 10,000,000 to 20,000,000 300 1 : 4 60 to 120 45 18 and 28 De Meritens alternators (550 revs.) Improved Serrin do. 397 1893 Mercury rotation. (The first installation of electric light at this lighthouse was in 1863.)
 Créac’h d’Ouessant (Ushant)
 [Barfleur (English Channel) 1903,
 La Coubre (Bay of Biscay) 1905,
 and Belle Île (Bay of Biscay)
 1903, similar]
2 flash 10 .10 to .14 15,000,000 to 30,000,000 300 1 : 4 60 to 120 45 18 and 28 2 De Meritens alternators, each of 5.5 k.w. (550 revs.) French Service pattern (1902) do. 225 1901 Twin optic, mercury rotation. (This light superseded a double-flashing electric light, similar to that now at Dunkerque, established in 1888.)
 Penmarc’h
 (Phare d’Eckmühl)
 (Finistère)
Single flash 5 .10 to .14 15,000,000 to 30,000,000 300 1 : 4 30 and 60 45 14 and 18 Two-phase Labour alternators (810 to 820 revs.) do. do. 197 1897 Twin optic, mercury rotation.
Planier
(near Marseilles)
Single flash 5 .10 to .14 15,000,000 to 30,000,000 300 1 : 4 30 to 60 45 14 to 18 De Meritens alternators (550 revs.) do. do. 207 1902 Twin optic, mercury rotation. (This light superseded an electric light established in 1881, showing a group of three white flashes separated by one red flash of the Calais type.)
Italy
 Tino (Gulf of Spezia)
3 flash 30 1.25  Undeter- 
mined.
700 1 : 24 50 110 200 50 15 25 35 do.
(830 revs.)
Berjot-Serrin do. 384 1885 Eight panels of three lenses each, no mirror.
America
 Navesink
 (Entrance to New York Bay)
Single flash 5 .08 About 60,000,000 700  Nearly 1 : 2  Max. 100 50 23 Alternating dynamos (800 revs.) Modified Serrin (Ciolina) Oil, each 25 h.p. 246 1898 Mercury rotation. Bivalve of 165°.
Australia
 Macquarie
 (Sydney, N.S.W.)
Single flash 60 8 5,000,000 920 1 : 16 55 110 50 15 25 De Meritens alternators (600 revs.) Serrin Gas 345 1883 16-panel revolving apparatus, with 180° fixed mirror.