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"On making Telescope Tubes in the 17th Century (An Anonymous Italian Manuscript)"
On Microscopes and Optics
On Microscopical Manipulation, Being the Subject-Matter of a Course of Lectures Delivered before the Quekett Microscopical Club, January-April 1869
On my friend Mr. Silvanus Morgan, his Book of Dialling
On Necessary and Contingent Truth: Considered in regard to some Primary Principles of Mathematical and Mechanical Science
On New Tables of the Moon's Parallax to be substituted for those of Burckhardt
On Occulting micrometers and their Value as applied to Exact Astronomical Measurements
"On Optical Apparatus Used in Lighthouses"
"On Period Relations in Babylonian Astronomy"
"On Period-relations in Babylonian Astronomy"
"On Plimpton 322. Pythagorean Numbers in Babylonian Mathematics"
On pocket sundials : 2 entries
On Poisons in relation to Medical Jurisprudence and Medicine
On Polishing the Specula of Reflecting Telescopes
"On Problems, Tasks and Working Aids in Solar Research"
"On Raising Water for the Purposes of Irrigation in the Colonies"
On repulsion resulting from radiation. Preliminary note on the Otheoscope
"On resistances with current and potential terminals"
On Rotatory Stability; and its Applications to Astronomical Observations on board Ships
"On Science and Social Change"
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