Petrographic Methods and Calculations; With Some Examples of Results Achieved

Petrographic Methods and Calculations; With Some Examples of Results Achieved

By (author) 

List price: US$24.41

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks


This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...and discoloured. Sooner or later it will therefore be necessary to cover the section afresh. Slides are sometimes broken without the section itself ' suffering injury, and in old slides cracking or discolora tion of the balsam may render the section unsightly and unserviceable. In such cases transference of the section to a new object-glass can generally be safely carried out, and the more arduous task of preparing a new section is thus avoided. The old slide, from which it is generally desirable to remove the cover-glass if it has not already flaked off, is placed side by side with a new object-glass on the heated copper plate, and some fresh balsam is placed on each. As soon as the film of old balsam beneath the section has melted, and bubbles have disappeared from the fresh balsam, a new cover-glass should be laid over the section in the way already described. The cover-glass with the section adhering to its lower surface may then be floated from the old object-glass to the new one. VVhen the old cover-glass is not in need of replacement it may be retained in contact with the section by placing upon it a drop or two of turpentine. As the lower film of balsam melts the evaporation of the turpentine keeps the upper film cool and cover-glass and section may then be floated off as before. If the thin section as a whole has come loose from both cover-glass and o-bject-glass, great care is necessary in remounting. It may be mounted in the same way as a cover-glass, but handling with fingers or forcep-tips should be avoided as far as possible by allowing it to slide from one position to another. Special Methods. The general method of procedure so far described may be safely followed with most homogeneous coherent rocks. But in cases more

Product details

  • Paperback | 128 pages
  • 189 x 246 x 7mm | 240g
  • United States
  • English
  • black & white illustrations
  • 1236764757
  • 9781236764751