Document ID: chunk:federal_register_of_legislation:F2023L01286:reg:1993:p1
Version: federal_register_of_legislation:F2023L01286
Segment Type: reg
Provision Reference: reg 1993 (pt 1/2)
Character Range: 36846–39668

1993              Light automated.

  3.8 Changes and conservation over time
The following section details the changes and conservation efforts to have been carried out at Gabo Island Lighthouse since its construction in 1862.
The Brewis Report
Commander CRW Brewis, retired naval surveyor, was commissioned in 1911 by the Commonwealth Government to report on the condition of existing lights and to recommend any additional ones. Brewis visited every lighthouse in Australia between June and December 1912, and produced a series of reports published in their final form in March 1913. These reports were the basis for future decisions made in relation to each individual lighthouses and provide a snapshot of the Gabo Island Lightstation in the early 20th century.
Recommendations made by Brewis for Gabo Island Lighthouse included: the installation of an occulting screen, clockwork mechanism, and 85 mm incandescent mantle, the discontinuation of the red auxiliary light, alteration of the fog signal, the provision of an efficient Morse lamp, and the removal of the danger light platform and lightning conductor.[34]
Gabo Island Light.
(20 miles from Green Cape.)
Lat. 37° 34' S., Long. 149° 55' E., Chart No. 3169.- Established 1862. Last altered, 1909. Lloyd's
  Signal Station.
Character.- Main Light.- One white, with red sectors. Catadioptric. Fixed. Candle-power –
  white, 15,000 c.p.; red, 3,750 c.p. Illuminant, vaporized kerosene; 55 mm. incandescent mantle.
Circular granite tower, 156 feet. Height of focal plane, 179 feet.
Auxiliary Danger Light.- Red; fixed; exhibited from base of same tower as main light.
Visibility.- Main Light.- Red, through an arc of 20 degrees, from 204° (S. 14° W. Mag.) to 224°
  (S. 34° W. Mag.); white, through an arc of 136 degrees, from 224° (S. 34° W. Mag.) to 55°
  (N. 45° E. Mag.); red through an arc of 39 degrees, from 55° (N. 45° E. Mag.) to 94° (N. 84° E. Mag.), and obscured elsewhere.
  Visible, in clear weather – white, for a distance of about 20 nautical miles; red, 10 nautical miles.
Auxiliary Danger Light.- Visible, in clear weather, 3 miles seaward.
Fog Signal.- Two explosive rockets fired in quick succession every ten minutes.
Optical Apparatus.- Chance Bros., 1860. Catadioptric. Fixed lens. Focal radius, 36 inches.
  Six panels with one catoptric mirror.
Condition and State of Efficacy.- The tower , lantern, and optical apparatus are in good condition
  and serviceable. The dwellings were repaired in 1911.
The light requires to be given a distinctive character.
The period of the fog signal is too long for the requirements of modern navigation.
The auxiliary red danger light is shown to warn a vessel of her close approach to the shore. In thick
  weather it may not be visible. (Caution in Light List.)
Three light-keepers are stationed here.