Fireside Science a Series of Popular Scientific Essays Upon Subjects Connected

Cover Fireside Science a Series of Popular Scientific Essays Upon Subjects Connected
Fireside Science a Series of Popular Scientific Essays Upon Subjects Connected
James R James Robinson Nichols
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This we have already described. The gem is adjusted in soft lead heaped conically in a copper cup, ten times the capacity of those used upon the cement sticks in cutting. The surface of the wheel is charged with diamond dust mixed with oil to the consistency of thin paste. The stone and wheel thus arranged, the latter is made to revolve at the rate of fifteen hundred revolutions a minute, and the stone, placed in a heavy iron clamp, is in- verted upon the wheel. Nothing but the diamond touches ...the wheel, it being pressed down by the weight of the iron clamp. A rather musical tone is produced by the contact, which shows that the wheel is doing its work, and that now a bright sur- face will be produced upon the " table " exposed to its action. When this is satisfactory, the operator melts the lead, releases the gem, and readjusts it so as to polish another of the faces, and in this way the process goes on until the work is completed. To attain this, however, the tables and faces are many times exposed to the wheel, and it is not until the most careful measurements and experiments are made that the gem is pronounced satisfactory.

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