 | James Dwight Dana - 1851 - 458 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1855 - 446 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | J.D. Dana - 1855 - 440 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1857 - 458 Seiten
...How is fiuor spar distinguished from beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1864 - 502 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1866 - 466 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a lathe, and worked...with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1876 - 458 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of be« ing brittle. It is usually turned in a lathe, and worked...with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1876 - 472 Seiten
...beautiful. The mineral is difficult to work on account of being brittle. It is usually turned in a latho, and worked down first with a fine steel tool ; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
 | James Dwight Dana - 1877 - 470 Seiten
...banded with yellowish white, are very beautiful. The mineral is difficult to work on account of be. ing brittle. It is usually turned in a lathe, and worked...with a fine steel tool; then with a coarse stone, and afterwards with pumice and emery. The crevices which occur in the masses are sometimes concealed... | |
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brittle. It is usually turned in a lathe, and worked down, first with a fine steel tool, then with a coarse stone, 