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  <front>
    <journal-meta>
      <journal-id journal-id-type="issn">2411-3336</journal-id>
      <journal-id journal-id-type="eissn">2541-9404</journal-id>
      <journal-title-group>
        <journal-title xml:lang="ru">Записки Горного института</journal-title>
        <journal-title xml:lang="en">Journal of Mining Institute</journal-title>
      </journal-title-group>
      <publisher>
        <publisher-name xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины ΙΙ</publisher-name>
        <publisher-name xml:lang="en">Empress Catherine II Saint Petersburg Mining University</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-15513</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15513</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Статьи</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Articles</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">A note on Becke's method for comparing the refractive indices of adjacent mineral grains in thin sections</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Заметка о способе Бекке для сравнения величин показателя преломления соседних зерен минералов в шлифах</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Zavaritskii</surname>
            <given-names>A. N.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Заварицкий</surname>
              <given-names>А. Н.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Zavaritskii</surname>
              <given-names>A. N.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru"> (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en"> (Russia)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="1912-12-01">
        <day>01</day>
        <month>12</month>
        <year>1912</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1912</year>
      </pub-date>
      <volume>3</volume>
      <fpage>319</fpage>
      <lpage>320</lpage>
      <history>
        <date date-type="received" iso-8601-date="1912-06-04">
          <day>04</day>
          <month>06</month>
          <year>1912</year>
        </date>
        <date date-type="accepted" iso-8601-date="1912-08-17">
          <day>17</day>
          <month>08</month>
          <year>1912</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1912-12-01">
          <day>01</day>
          <month>12</month>
          <year>1912</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 1912 А. Н. Заварицкий</copyright-statement>
        <copyright-statement xml:lang="en">© 1912 A. N. Zavaritskii</copyright-statement>
        <copyright-year>1912</copyright-year>
        <copyright-holder xml:lang="ru">А. Н. Заварицкий</copyright-holder>
        <copyright-holder xml:lang="en">A. N. Zavaritskii</copyright-holder>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="ru">
          <license-p>Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)</license-p>
        </license>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="en">
          <license-p>This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/15513">https://pmi.spmi.ru/pmi/article/view/15513</self-uri>
      <abstract xml:lang="ru">
        <p>Этот способ, предложенный Бекке в 1893 году, получил широкое распространение. Как известно, он основан на наблюдении за перемещением светлой полоски, появляющейся при употреблении сильных объективов на границе соседних зерен минералов, если передвигать тубус микроскопа, фокусируя его то на верхнюю (верхняя установка), то на нижнюю поверхность шлифа (нижняя установка).</p>
      </abstract>
      <abstract xml:lang="en">
        <p>This method, proposed by Becke in 1893, has become widely adopted. As is known, it is based on observing the movement of a bright strip that appears when using high-magnification objectives at the boundary between adjacent mineral grains, as the microscope tube is shifted, focusing alternately on on the upper (upper focus) and the lower surface (lower focus) of the thin section.</p>
      </abstract>
    </article-meta>
  </front>
  <body/>
  <back>
    <ref-list>
      <ref id="ref1">
        <label>1</label>
        <mixed-citation xml:lang="ru">F. Becke — Über die Bestimmbarkeit der Gesteinsgemengtheile, besonders der Plagioklase auf Grund ihres Lichtbrechungsevermögens. Sitzungsberichte der math. nat. Classe der k. Akad. Wien. 102 Abt. 1.</mixed-citation>
        <mixed-citation xml:lang="en">F. Becke — Über die Bestimmbarkeit der Gesteinsgemengtheile, besonders der Plagioklase auf Grund ihres Lichtbrechungsvermögens. Sitzungsberichte der mathematisch-naturwissenschaftlichen Classe der kaiserlichen Akademie der Wissenschaften in Wien, 102, Abteilung 1.</mixed-citation>
      </ref>
      <ref id="ref2">
        <label>2</label>
        <mixed-citation xml:lang="ru">Rosenbusch и Wülfing; Duparc и Pearce; Iddings; Weinschenk (въ несколько изменезном виде).</mixed-citation>
        <mixed-citation xml:lang="en">Rosenbusch und Wülfing; Duparc et Pearce; Iddings; Weinschenk (in a somewhat modified form).</mixed-citation>
      </ref>
      <ref id="ref3">
        <label>3</label>
        <mixed-citation xml:lang="ru">Е. С. Федоров. «Основы петрографии» и «Курс кристаллографии»</mixed-citation>
        <mixed-citation xml:lang="en">E. S. Fedorov. Fundamentals of Petrography and Course in Crystallography.</mixed-citation>
      </ref>
      <ref id="ref4">
        <label>4</label>
        <mixed-citation xml:lang="ru">Лучицкий «Курс петрографии» (рис. по Вейншенку)</mixed-citation>
        <mixed-citation xml:lang="en">Luchitsky. Course in Petrography (figures after Weinschenk). (in Russian)</mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>
