This was replaced by mercury vapour lamps in 1978 and in 1980 an electrical temporary power beam was installed with a gear less pedestal and array system later in the same year.
22.
There are a total of 9, 745 street lamps : 492 sodium lamps, 2, 061 mercury vapour lamps, 7, 180 tube lights and twelve high mast beam lamps.
23.
There are a total of 3, 570 street lamps in Tiruvannamalai : 496 sodium lamps, 61 mercury vapour lamps, 3, 010 tube lights and three high mast beam lamp.
24.
As of 2011, the municipal corporation maintained 5, 241 street lamps : 735 sodium lamps, 73 mercury vapour lamps, 4, 432 tube lights and one high mast beam lamp.
25.
There are a total of 2, 072 street lamps : 222 sodium lamps, one mercury vapour lamps, 1, 748 tube lights and one high mast beam lamp in the town.
26.
As of 2011, the municipality maintained a total of 2, 584 street lamps : 706 sodium lamps, 151 mercury vapour lamps, 2, 274 tube lights and three high mast beam lamp.
27.
Of these amounts, it is important to note that the lungs absorb about 80 % of inhaled mercury whereas only about 0.01 % of swallowed mercury vapour is absorbed through the gastrointestinal tract.
28.
As of 2011, the municipality maintained a total of 5, 489 street lamps : 754 sodium lamps, 173 mercury vapour lamps, 4, 551 tube lights and eight high mast beam lamp.
29.
One of the problems workers faced was mercury poisoning; mercury was used to separate the fur from the rabbit hide and workers were in regular contact with fur impregnated with mercury or exposed to mercury vapour.
30.
As of 2011, the municipality maintained a total of 1, 309 street lamps : 146 sodium lamps, 42 mercury vapour lamps, 1, 037 tube lights, 35 ordinary lights and seven solar.
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