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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-11861</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/11861</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Без раздела</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Without section</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Application of chemical etching at processing of crystals of Iceland spar</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Применение химического травления при обработке кристаллов исландского шпата</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author" corresp="yes">
          <name name-style="eastern">
            <surname>Kukuy</surname>
            <given-names>A. L.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Кукуй</surname>
              <given-names>А. Л.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Kukuy</surname>
              <given-names>A. L.</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 contrib-type="author">
          <name name-style="eastern">
            <surname>Skropyshev</surname>
            <given-names>A. V.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Скропышев</surname>
              <given-names>А. В.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Skropyshev</surname>
              <given-names>A. V.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <xref ref-type="aff" rid="aff2"/>
        </contrib>
        <aff-alternatives id="aff2">
          <aff>
            <institution xml:lang="ru"/>
          </aff>
          <aff>
            <institution xml:lang="en"/>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="1971-02-01">
        <day>01</day>
        <month>02</month>
        <year>1971</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1971</year>
      </pub-date>
      <volume>60</volume>
      <issue>2</issue>
      <fpage>86</fpage>
      <lpage>90</lpage>
      <history>
        <date date-type="received" iso-8601-date="1970-08-27">
          <day>27</day>
          <month>08</month>
          <year>1970</year>
        </date>
        <date date-type="accepted" iso-8601-date="1970-10-12">
          <day>12</day>
          <month>10</month>
          <year>1970</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1971-02-01">
          <day>01</day>
          <month>02</month>
          <year>1971</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 1971 А. Л. Кукуй, А. В. Скропышев</copyright-statement>
        <copyright-statement xml:lang="en">© 1971 A. L. Kukuy, A. V. Skropyshev</copyright-statement>
        <copyright-year>1971</copyright-year>
        <copyright-holder xml:lang="ru">А. Л. Кукуй, А. В. Скропышев</copyright-holder>
        <copyright-holder xml:lang="en">A. L. Kukuy, A. V. Skropyshev</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/11861">https://pmi.spmi.ru/pmi/article/view/11861</self-uri>
      <abstract xml:lang="ru">
        <p>Исландский шпат является основным материалом различного рода оптических деталей, которые вырезают из. бездефектных частей природных кристаллов. Качество кристаллов определяют после их рас­пиливания на пластины, применяя механическое шлифование и полиро­вание плоскостей распила. Так как большая часть кристаллов содер­жит те или иные дефекты, то основная часть работы по механической обработке пластин тратится впустую. Кроме того, распиловка кристал­лов и их частей вслепую (в большинстве случаев качество поверхно­сти кристаллов не позволяет даже ориентировочно выявлять бездефект­ные области) приводит к потере ценного материала.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>Iceland spar is the main material of various kinds of optical parts, which are cut from. defect-free parts of natural crystals. The quality of crystals is determined after cutting them into plates by applying mechanical grinding and polishing of the cutting planes. Since most of the crystals contain one or another defect, most of the work on mechanical processing of plates is wasted. In addition, sawing crystals and their parts blindly (in most cases, the surface quality of crystals does not allow even tentatively identify defect-free areas) leads to the loss of valuable material.</p>
      </abstract>
    </article-meta>
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