Transactions . caustic soda) usedat 100° c. Near the eutectoid point (saturation point) to 1 per cent, carbon it is often difficult to distin-guish between the veins and envelopes of pure iron orferrite and the carbide, cementite. In the abovesolution cementite heat-tinting we can distinguish between carbide and phosphide of iron, also by etching with (3). For alloys, various reagents have been used. For most ^ork use:— (1) Ten per cent, nitric acid: white metals, bearing metals, etc. (2) Fifty per cent, nitric acid: copper-rich alloys, brass, bronze, blister and other grades of
Transactions . caustic soda) usedat 100° c. Near the eutectoid point (saturation point) to 1 per cent, carbon it is often difficult to distin-guish between the veins and envelopes of pure iron orferrite and the carbide, cementite. In the abovesolution cementite heat-tinting we can distinguish between carbide and phosphide of iron, also by etching with (3). For alloys, various reagents have been used. For most ^ork use:— (1) Ten per cent, nitric acid: white metals, bearing metals, etc. (2) Fifty per cent, nitric acid: copper-rich alloys, brass, bronze, blister and other grades of copper. Immersetill the structure shows up good type of microscope can be used. It ought to havea fair working distance between the objective and the stage. Arevolving stage is an advantage and so is one which can be raisedand lowered by rack and pinion. In examining opaque materialtransmitted light cannot be used and the specimen must beilluminated from above by means of reflectors. With a one-.
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
