The unedited full-text of the 1906 Jewish Encyclopedia
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American calendarer; born 1825 at Raczek, Poland; educated under Judah Bacharach, Moses Leib of Kutna, and others; emigrated to New York on June 30, 1847. During 1886 and 1887 he was principal of the Talmud Torah in New York. Isaacs has contributed articles to the American Jewish press, and also a number of articles of a Talmudical nature to the "Torah me-Ẓiyyon," a monthly periodical published at Jerusalem, two of which articles, "Ḥadshe ha-Shanah" and "Petaḥ 'Inim," have been reprinted in pamphlet form (1901-02).

Isaacs is the compiler of an "Artificial Perpetual Calendar" and of a "Civil and Ecclesiastical Perpetual Calendar" (New York, 1891).

  • For a description of Isaacs' perpetual calendars see Seminary, March, 1894, pp. 77, 91;
  • The Sun (New York), Sept. 14, 1893;
  • The Scientific American, May 7, 1892.
A. I. G. D.
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