AUCKLAND MUNICIPAL HANDBOOK
are of 2,000 candle power, 32 of 1,000 candle power, 65 of 100 candle power, and 26 of 32 candle power.
Gas lights, of which there are 920, each 50 candle power (nominal), are used for the illumination of residential and suburban streets.
BRIDGES.
The only bridge of any importance in the City, with the exception of one or two bridges belonging to the Railway Department, is the Grafton Bridge, the others being wooden structures over creeks, etc.
Grafton Bridge is notable as having the longest three-hinged arch in the world, and was, at the time of its construction, the longest single-span arch constructed in reinforced concrete.
The Bridge, which is 973 feet in length, consists of 11 girder spans, besides the central arch span, made up as follows:—
- One span of 35 feet.
- One span of 37.5 feet.
- Three spans of 75.5 feet each.
- One span of 81 feet.
- Two main piers, 13 feet each.
- Centre span, 320 feet.
- One straight girder, 83.5 feet.
- One straight girder, 80.5 feet.
- One straight girder, 41 feet.
The balance is made up by filled up approaches of 20 and 22 feet respectively at each end.
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