Document ID: chunk:federal_register_of_legislation:F2023L01231:clause:7b_2028:p3
Version: federal_register_of_legislation:F2023L01231
Segment Type: clause
Provision Reference: sch 7B cl 2028 (pt 3/8)
Character Range: 137763–140495

Character – pattern of flashes of light emitted by a lighthouse, designed to identify that particular lighthouse.

Copper – a red malleable metal of low resistivity.

E
External catwalk – a landing around the external face of the tower complete with hand rail. Cape Sorell's external catwalk is 1899 Chance Bros cast iron lattice panels.

F
Flagstaff – a structure whereby signalling flags could be attached for communication with passing vessels.

I
Intermediate floors – levels found mid-way up a building. Cape Sorell has four slate intermediate floors.
Internal catwalk – an open landing inside the tower complete with handrail. Cape Sorell's internal catwalk is 1899 Chance Bros cast iron lattice panels.

Iron – there were two common types of iron used in lighthouse construction: wrought and cast. Older lights will almost certainly contain these iron types. Wrought iron has been worked by hand and is an iron alloy with a very low carbon content in contrast to steel, it also has fibrous inclusions. Cast iron is iron which has been heated until it liquefies, and is then poured into a mould to solidify.

L
Lantern – the glazed enclosure, usually of cylindrical or polygonal shape, at the top of a lighthouse, which surrounds and protects the optical apparatus. It contains the optical apparatus, made up of the lantern roof, lantern glazing and lantern base sections.
Lantern floor – the level in a lighthouse at which the lantern is installed, and by which access may be gained to the optical system and to the inside and outside of the lantern glazing. The lantern floor is generally at or near the same level as the catwalk and can be made from steel, concrete, or timber.
Lantern glazing – the middle section of the lantern, circular or polygonal in plan, between the lantern roof above and the lantern base below, made up of glass panes held in a framework of glazing bars. On the landward side there may be blank panels in place of glass, or other opaque construction. Types of lantern glazing include: flat and curved trapezoidal panes and curved diamond/triangular panes. Cape Sorell's lantern glazings are curved, rectangular glass.
Lantern roof – the roof of the lantern. Usually made of copper sheeting over a framework of rafters.
Lens assembly – a transparent optically refracting element of glass. The surface is usually spherical in form.
Light source – electric bulbs now illuminate most lighthouses.
Lighthouse – the principal structure of a lightstation, generally made up of a lantern, balcony and tower.
Lightstation – a precinct containing a lighthouse structure and other related buildings, for example, keepers' cottages, store room and signal house.

O

Order – a shorthand expression of the size