Douglas, Isle of Man - Lighthouse, Head - Plastichrome postcard c.1960s

• Postcard

   

• Picture / Image:  The Lighthouse, Douglas Head, Isle of Man
• Publisher: Plastichrome / Ranscombe Photographics of Douglas No. RB172
• Postally used: no
• Stamp:  n/a
• Postmark(s): n/a
• Sent to:  n/a
• Notes / condition: 

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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Douglas Head Lighthouse is a lighthouse at Douglas Head on the Isle of Man located between England and Ireland.

The lighthouse was established in 1857, although the vicinity was under the control of the Isle of Man Harbour Board from 1832.

It was made by the engineering brothers David and Thomas Stevenson with a total elevation of 32 metres (105 ft). The white tower is 20 metres (66 ft) in height and its base is at an elevation of 12 metres (39 ft).

The lighthouse staircase has 71 steps and the light has an average range of 24 nautical miles (44 km).[1] The lantern is composed of eight brilliant reflectors made of pure silver built in 1831. The light flashes white every ten seconds.

Structural problems required the lighthouse to be rebuilt in 1892.

The lighthouse became automated in 1986.

Recently, a new public footpath was constructed by the Commissioners from the top of Port Skillion down to the Lighthouse for the benefit and enjoyment of tourists and sightseers.

Ownership

After the establishment of the new lighthouse in 1857, jurisdiction transferred from the Commissioners of Douglas Harbour to the Commissioners of the Northern Lighthouse. The lighthouse is still run to this day by the Commissioners of the Northern Lighthouse, who also operate the Northern lighthouse on the Isle of Man.

Etymology

The modern completed lighthouse with foghorn c.1907 with courthouses

The name Douglas means 'Blackstream' (Dubh -black and Glais -stream. Some Manx people believe the name was derived from two rivers, the Dhoo and the Glass, the black and green streams of the Greu river.

Specifics of the light

The 12-metre (39 ft) high light has two double banked units of twelve lamps mounted facing in opposite directions, rotated by an AGA PRB21 Gearless Drive Unit operating at three revolutions-per-minute, thus giving a flash in any given direction every ten seconds.

Only eight out of the twelve lamps on each face are used in normal operation. They are rated at 30 volts 200 watts, but run at 25 volts 150 watts to provide increased service life. The other four lamps are 6 volts 28.5 watts and are used only as emergency lamps. Such emergencies may be loss of mains electric power or, far less likely, the complete failure of the main lamp banks. The four lamps in each of the two main banks are connected in series, which gives each unit the same intensity; however, if one lamp fails, all four in that bank go out. The four emergency lamps on each face are also connected in series in sets of two. Power is provided by emergency batteries. The emergency light is a 200 millimetres (8 in) lantern mounted on the balcony rail.