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Canada balsam |
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balsam /bal·sam/ (bawl´sam) 1. a semifluid, resinous, and fragrant liquid of vegetable origin, usually trees; often composed chiefly of resins, volatile oils, and various esters.balsam´ic 2. balm. Canada balsam an oleoresin from the balsam fir, used as a microscopic mounting medium. balsam of Peru , peruvian balsam a thick brown liquid from the tree Myroxylon pereirae, used as a local protectant and rubefacient. tolu balsam a balsam obtained from the tree Myrotoxylon balsamum, used as an expectorant and pharmaceutic aid.
Canada balsam A transparent resinous substance produced by the sap of the Canadian balsam fir and used to cement glass (doublet, beam-splitting prisms, the segment of a bifocal lens, etc). Its index of refraction is equal to about 1.54. It has nowadays been superseded by modern chemical adhesives. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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