Document ID: chunk:federal_register_of_legislation:F2022L01334:reg:2027:p3
Version: federal_register_of_legislation:F2022L01334
Segment Type: reg
Provision Reference: reg 2027 (pt 3/8)
Character Range: 163683–166439

complete with hand rail. Smoky Cape's external catwalk is composed of 1891 Chance Bros cast iron lattice floor panels supported on openwork cast iron brackets bolted to the lantern base.
G
Glazing bar
Rebated bars of metal which retain the panes of glass in a window. Often consist of vertical angled steel members joining between done support ring and murette. Often the glazing bar has a tenon that matches a mortise in the murette. Astragals are arranged helically. Helical and trapezoidal glazing bars were used where a fixed light was in use (flashing or non-rotating) as vertical bars cut off portions of the light. In comparison, a helical bar design crosses the light source at an angle, obscuring part of it.
I
Incandescent kerosene
A light fuel once utilised by lighthouses to ignite and fuel the lantern. Smoky Cape used kerosene to fuel its lantern before its introduction to electricity.
Intermediate floors
Levels found mid-way up a building. Smoky Cape's intermediate floor is composed of cast iron plate on rolled iron beams built into tower walls.
Internal catwalk
An open landing inside the tower complete with handrail. Smoky Cape's internal catwalk is composed of cast iron lattice floor panels supported on solid cast iron brackets bolted to the upper section of the lantern base.
L
Lantern
The glazed enclosure 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 murette 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 cane 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. The Smoky Cape Lightstation uses flat trapezoidal glass panes.
Lantern roof
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 lamps and LEDs 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