Astragals (2): Difference between revisions
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2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b) | 2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b) | ||
[[Image:Ch2_Fig16b.jpg|400px]] | |||
Note 1: In Britain, the term is used in sense 2 only in respect of a fixed lens. | Note 1: In Britain, the term is used in sense 2 only in respect of a fixed lens. | ||
Revision as of 09:01, 1 March 2009
2-4-015
1. Bars used to support the glazing and the roof of a lantern.
2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b)
Note 1: In Britain, the term is used in sense 2 only in respect of a fixed lens.
Note 2: The German term Verstrebungen is also used for bars supporting the optical elements of a prismatic lens or of a fixed lens.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
