7 Piece Bowen's Reaction Series Mineral Specimen Set Light & Optics_Color Plug type resistance box with constantan wire Plug type resistance box with constantan wire coils between split brass contact blocks Bell jar constructed from soda glass measures 20 x 10cm with ground glass base for vacuum demonstrations and chemistry specimen display this 7 piece Bowen's Reaction Series set traces the crystallization sequence from olivine through quartz Built for igneous petrology teaching
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7-Piece Bowen's Reaction Series Mineral Specimen Set Light & Optics_Color Plug-type resistance box with constantan-wire