Lexicon Technicum: or, An Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves was in many respects the first alphabetical encyclopedia written in English, compiled by John Harris, with the first volume published in 1704 and the second in 1710. Although the emphasis of the Lexicon Technicum was on mathematical subjects, its contents go beyond what would be called science or technology today, in conformity with the broad eighteenth century understanding of the terms "arts" and "science," and it includes entries on the humanities and fine arts, notably on law, commerce, music, and heraldry. However, the Lexicon Technicum neglects theology, antiquity, biography, and poetry. Source: Wikipedia (en)