Practical Blowpipe Assaying |
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Page 14
... bead has been obtained add the portion to be assayed to it whilst it is still hot ; or if that is not practicable moisten the flux bead slightly and let the assay adhere to it . Fuse the assay over the lamp , and the appearance of the bead ...
... bead has been obtained add the portion to be assayed to it whilst it is still hot ; or if that is not practicable moisten the flux bead slightly and let the assay adhere to it . Fuse the assay over the lamp , and the appearance of the bead ...
Page 19
... beads of gold , silver , copper , & c . For blowpipe assay purposes another balance is required , which will weigh upwards of 30 ounces , and at the same time must be sensitive and portable . The author , after experimenting for several ...
... beads of gold , silver , copper , & c . For blowpipe assay purposes another balance is required , which will weigh upwards of 30 ounces , and at the same time must be sensitive and portable . The author , after experimenting for several ...
Page 23
... beads upon , and to re- move slags from buttons obtained in fusing assays . To prevent the buttons flying off and being lost , always wrap them up in a piece of paper before using the hammer . One of the most necessary implements used ...
... beads upon , and to re- move slags from buttons obtained in fusing assays . To prevent the buttons flying off and being lost , always wrap them up in a piece of paper before using the hammer . One of the most necessary implements used ...
Page 25
... beads obtained in cupellation ( fig . 32 ) . FIG . 32. ( Half size . ) Iron forceps , very strong , are useful in rough work , such as holding a button of metal whilst it is hammered on the anvil , or raising and cleaning the lamp wick ...
... beads obtained in cupellation ( fig . 32 ) . FIG . 32. ( Half size . ) Iron forceps , very strong , are useful in rough work , such as holding a button of metal whilst it is hammered on the anvil , or raising and cleaning the lamp wick ...
Page 26
... beads from slags and cupels , also in sepa- rating a button from slag by gently press- ing the substance after placing it near the inner part of the jaw , or to clean a cupel bead the same way . Good pliers are often strained by placing ...
... beads from slags and cupels , also in sepa- rating a button from slag by gently press- ing the substance after placing it near the inner part of the jaw , or to clean a cupel bead the same way . Good pliers are often strained by placing ...
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Common terms and phrases
alloy amalgam antimony arsenic arsenide assay batéa bead bismuth blowpipe blue flame boil bromine button carbonate Cents Fine Dollars charcoal chlorine Class clear glass Cloth coal cobalt colour colourless compounds containing cooling copper crucible cupel diameter dissolved Dollars Cents easily Engineers English Mint Value filter finely powdered Fineness of Gold flux furnace fused fusion globule Gold Value grain borax glass heat hydrochloric acid Illustrated inch iridium iron litharge lithia matrass mercury method mineral mixed nickel nitric acid obtained opaque Ounce Fineness outer flame oxidised phosphate phosphate salt piece platinum platinum wire potash precipitate present pure reaction reduced requires retort roasting saturated scorify sesquioxide silica Silver Assay slag small quantity soda on charcoal solution steel sublimate substance sulphate sulphides Table tellurium titanic acid treated tube Value of Gold-continued Value per Ounce volatilised washed weight of lead whilst yellow yellowish zinc
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