Canada balsam, also called Canada turpentine or balsam of fir, is a turpentine which is made from the oleoresin of the balsam fir.
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The resin is used to produce Canada balsam, and was traditionally used as a SPF lumber ), siding and pulped for paper manufacture.
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During World War II, due to a scarcity in Canada Balsam, he developed and patented an indigenous substitute, which he called " India Balsam ".
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Canada balsam can do the job, but may not be very long lasting in that situation . talk ) 10 : 53, 11 November 2011 ( UTC)
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The Wollaston prism consists of two orthogonal calcite prisms, cemented together on their base ( traditionally with Canada balsam ) to form two right triangle prisms with perpendicular optic axes.
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It is also a constituent of the essential oil of " Eucalyptus dives " . ?-Phellandrene has been isolated from the oil of water fennel and Canada balsam oil.
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Notable examples of plant resins include amber, Balm of Gilead, balsam, Canada balsam, Boswellia, copal from trees of " Spinifex " grasses, and turpentine, distilled from pine resin.
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Nicol made his prism by bisecting a parallelepiped of Iceland spar ( a naturally occurring, transparent crystalline form of calcium carbonate ) along its shortest diagonal, then cementing the two halves together with Canada balsam.
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Relief is a measure of the difference between the index of refraction of the mineral and that of the medium ( often Canada balsam or other epoxy with an RI of around 1.53-1.54 ).
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It consists of a rhombohedral crystal of Iceland spar ( a variety of calcite ) that has been cut at an angle of 68?with respect to the crystal axis, cut again diagonally, and then rejoined as shown, using a layer of transparent Canada balsam as a glue.
