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The method of calculating the magnifying power of a reflecting telescope
illustrated by example. With a general table of all the Magnifying Powers of 12 such Telescopes, from 4 to 100 Inches focal Distance of the Great Speculum -
The description and use of a new invented pocket reflecting microscope
With a Micrometer. The Power of Magnifying by this Microscope, and the use of the Micrometer in Measuring small Objects therein, made plain and easy by calculations. The Method of adapting this Microscope into a Walking-Cane, or Whip. The Description of an Universal Microscope, or the Method of mounting the Microscope on a Ball and Socket that renders it of universal Use. The Double Micrometer described, and its Use in the universal Microscope explained. The way of computing the Power of Magnifying in Telescopes, and of measuring the Heavenly Bodies by the Double Micrometer, fitted thereto. Instructions for rightly using the Microscope, Telescope, &c. The whole illustrated with Copper-Plate Figures. By Benj. Martin -
A supplement to the Philosophia Britannica
Appendix I. Containing New Experiments in electricity, and The Method of making artificial magnets. Illustrated with Copper-Plates. By Benjamin Martin -
An essay on a new construction, of the reflecting telescope, which by means of a scale of magnifying powers, is made on universal perspective. Performing The Office Of I. Of a common Reflecting Telescope. II. Engyscope, for shewing all near Objects. III. A Megalascope, for all the larger Sort of small Objects. IV. A Microscope, for small Objects. V. A Helioscope for making the Sun's Image by Reflection only. VI. A Helioscope by Reflection and Refraction. Vii. A Solar-Disk Microscope. Viii. A Catadioptric Microscope