Liu Hsien-chou, "Chinese inventions in horological engineering," _Ch'ing-Hua University Engineering Journal_, 1956, vol.' [Please select]
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Alan Lloyd, _Giovanni de Dondi's horological masterpiece, 1364_, without date or imprint (.) [Please select]
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A mechanic who would work intelligently should possess a thorough knowledge of the materials constantly used, and oil is used on every horological mechanism. [Please select]
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_The above (33-36) are not exact, being the statement of experimental laws, and admit of considerable modification when applied in horological science, as will be shown (41-42.) [Please select]
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