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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 Bekke's method for comparing the refractive index values of neighboring 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 Bekke in 1893, has become widespread. As is known, it is based on observing the movement of a light strip that appears when using strong lenses at the boundary of neighboring mineral grains, if you move the microscope tube, focusing it either on the upper (upper setting) or on the lower surface of the section (lower setting).</p>
      </abstract>
    </article-meta>
  </front>
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  <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>
      </ref>
      <ref id="ref2">
        <label>2</label>
        <mixed-citation xml:lang="ru">Rosenbusch’a и Wülfing’a; Duparc’a и Pearce’a; Iddings’a; Weinschenk’a (въ нѣсколько измѣнезномъ видѣ). Изъ русскихъ: «Основ. Петр.». и «Курсъ кристал». Е. С. Федорова, «Курсъ петрогр.». Лучицкаго (рис. по Вейншенку) и др.</mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>
