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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-15246</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15246</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Геология</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Geology</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Checking the optical constants given in "The microscopique determination of the nonopaque minerals" by E. Larsen</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Проверка оптических констант, приведенных в "The microscopique determination of the nonopaque minerals" Е. Ларсена</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Levitskii</surname>
            <given-names>O. D.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Левицкий</surname>
              <given-names>О. Д.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Levitskii</surname>
              <given-names>O. D.</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="1929-03-01">
        <day>01</day>
        <month>03</month>
        <year>1929</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1929</year>
      </pub-date>
      <volume>7</volume>
      <issue>3</issue>
      <fpage>201</fpage>
      <lpage>210</lpage>
      <history>
        <date date-type="received" iso-8601-date="1928-09-24">
          <day>24</day>
          <month>09</month>
          <year>1928</year>
        </date>
        <date date-type="accepted" iso-8601-date="1928-11-27">
          <day>27</day>
          <month>11</month>
          <year>1928</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1929-03-01">
          <day>01</day>
          <month>03</month>
          <year>1929</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 1929 О. Д. Левицкий</copyright-statement>
        <copyright-statement xml:lang="en">© 1929 O. D. Levitskii</copyright-statement>
        <copyright-year>1929</copyright-year>
        <copyright-holder xml:lang="ru">О. Д. Левицкий</copyright-holder>
        <copyright-holder xml:lang="en">O. D. Levitskii</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/15246">https://pmi.spmi.ru/pmi/article/view/15246</self-uri>
      <abstract xml:lang="ru">
        <p>Проверка производилась при помощи диаграмм А.К. Болдырева. Велась проверка следующим образом (см. статью). При чем оказалось, что расхождения не превышают 1/2°, в некоторых случаях, при очень малых ∆g и ∆р, точность отсчета спускалась до 1°, но последнее редко. При проверке обнаружились большие расхождения между величинами 2 V, приведенными у Ларсена, и 2 V, полученными по диаграммам (см. статью). Всего было проверено 380 минералов.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>The check was carried out using diagrams by A.K. Boldyrev. The check was carried out as follows (see article). It turned out that the discrepancies did not exceed 1/2°; in some cases, with very small ∆g and ∆р, the reading accuracy dropped to 1°, but the latter is rare. Upon inspection, large discrepancies were discovered between the values of 2 V given by Larsen and 2 V obtained from the diagrams (see article). The total of 380 minerals were tested.</p>
      </abstract>
      <kwd-group xml:lang="ru">
        <title>Ключевые слова</title>
        <kwd>-</kwd>
      </kwd-group>
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