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95
Cost of Plant.
The first Plant was erected at the end of 1905 and beginning of 1906.
£ s. d. £ s. d.
1905-6. Installation—Initial outlay ... 325 0 0
Fittings, etc., Electricity Department
71 7 11
Sundries, Electricity Department
11 13 10
Structure of Depot, Works
Department 120 6 1
Sundries 31 4 8
Carboys 23 16 9
583 9 3
The second Plant was installed at the beginning of the year 1910
and with alterations to the first plant cost in round figures £501.
Condition of Plant.
After working for nearly five years and not having been cleaned for
a period of over twelve months, the apparatus was taken to pieces, overhauled
and thoroughly cleaned. The platinum wire and slates upon which
it is wound were found in perfect condition—these are the positive
electrodes and are the costly portion of the plant.
The somewhat altered shape of the new zinc electrodes will without
doubt considerably increase their lives and give greater efficiency in
the working of the plant.
With a current of 25 amperes there is obtained over 6 grammes of
chlorine per litre. This efficiency is no doubt due to the new shape of
the electrodes and to the earthenware tanks.
The tanks are made of earthenware (which if well glazed will never
wear out). Earthenware is one of the best insulating materials. Tanks
made of slate contain iron (it seems impossible to obtain slate free from
iron) and were being constantly destroyed by the action of the electric
current and had to be often replaced.