When it is considered that the small-pox is one of the chief causes of depopulation ... / [John Coakley Lettsom].
- John Coakley Lettsom
- Date:
- 1779]
Licence: Public Domain Mark
Credit: When it is considered that the small-pox is one of the chief causes of depopulation ... / [John Coakley Lettsom]. Source: Wellcome Collection.
6/90 page 2
![that the Line deferibed by a ProjeCtile is a Para- The Experiments upon which the Art of Gunne¬ ry does depend, moft exaftly perform’d. 6th_Experiments concerning Pendulums. The Defcription and chief Properties of the Cy¬ cloid, and the Application of Cycloidal Cheeks for regulating the Vibrations of Pendulums. Ail Experiment to Ihew the Analogy between the Swings of a Pendulum and the Waves of the Sea. Experiments concerning the Expanfion of Metals by Heat. 7ch_The Laws of Motion in the Collifion of Hard and Elaftick Bodies. # . Experiments concerning the Centrifugal and Cen¬ tripetal Forces of Solid and Fluid Bodies in Motion. Experiments in order to eftimate the Centrifugal Forces of Solid Bodies. MAGNET I G K S. 8th Day. A TtraCtive and Directive Powers of Loadflones. The Form or Poficion of Filings of Iron at the Poles and Equator of a Loadftone. Magnetick Power aCts thro’ all Bodies but Iron. The Attraction of different, and Repulfe of cor- refponding Poles. ‘ The manner of touching and untouching of Needles. , The Law of Magnetick Attraction difeover’d. pth_The Phenomena of Terrellor Spherical Load (tones. The Direction of Magnetick Needles on the Sur¬ faces of TerrelU nearly cowards the Poles. Their Variation Eaft and Weft. The Inclinatory or Dipping-Needle, with the Law of the Alteration of that Inclination on the Surface of a Ten el la. The Terreftrial Magnetifm conhder’d. The Application ot the Dipping-Needle to^ the Difcovery of the Longitude and Latitude of Places by Land and Sea. © P T I C K S. 30th Day. J7 Xperiments to demonftrate, that in l j the Rays of Light the Angle of In¬ cidence is equal to the Angle of Reflection in all Sorts of Surfaces. The Method of tracing the reflected Rays of Light from Plain, Convex, Concave, and Cylindri¬ cal Superficies, with all their wonderful Properties and Dies, fhew’d and explain’d. nth—Sir If.Nemoiis RefleCtingTelefcope exhibited, and its ConftruCtion explained $ together with Lome Specimens of its Ufes in obferving the Planets and Fixed Stars. ■ V'i] 12th—-Experiments to fhew the Manner of Re¬ fraction. The Sines of the Angles of Incidence and Re¬ fraction, fhewn to be ( at all Degrees of Incidence ) in a confiant Proportion to each other. An Inflrument to meafure the Refraction of Fluids. The Method of tracing the Refracted Rays of Light thro’ Plain, Convex, and Concave Superficies. 13th_An artificial Eye, in which all the Coats and Humours are curioufly reprefented. The DifleCtion of the Eye. The Explication of Vifion by the naked Eye, deduced from Experiments. j 14th—All the Effects, Properties, and Ufes of Plain, Convex, and Concave GlafTes, both Angle and combin’d in Telefcopes and Microfcopes, fhew’d and explain’d. Several Kinds of Microfcopes and Telefcopes, with the Manner of applying them to their refpeCtive Objects 5 together with a Specimen of the Ufes of fuch Microfcopes and Telefcopes. A Multiplying Glafs. The Magick Lanthorn. i$th—A particular Apparatus to manifeft and meafure the Refraction of Air. The Camera Obfcura. The Theory of Light and Colours, as delivered by Sir Ifaac Newton, demonftrated by feveral of his principal Experiments. The Archbifhop of Spalatos Experiment, which difeovered the Caufe of the Rainbow. Monfieur /fugens Experiments, which difeover the Caufes of Halo’s, of the Mock Suns and Moons, and of inverted Rainbows. Experiments concerning the blending and Pro¬ duction of Colours by Motion, HYDROSTATICKS. 16th Day.T^hAT Fluids gravitate in proprio Ioc$r A the upper Parts continually prefling upon the lower: That this Preffure is not only pro¬ pagated Downwards, but even Upwards, and Side¬ ways, according to all poflible Directions-, That a lighter Fluid may gravitate upon a heavier, and an | heavier upon a lighter j That a Fluid may fuftain a Body heavier in Specie than it felf, and even raife ic up j That a Fluid may detain a Body lighter in Spe¬ cie than it felf, and even deprefs it. A general Ex¬ periment to prove, that a competent Preflure of a Fluid may produce the remarkable Phenomena of the'Torricellian Tube, the Pump, Syringe, Syphon, policed Plates, and other Effects of the like Nature.](https://iiif.wellcomecollection.org/image/b30791947_0006.jp2/full/800%2C/0/default.jpg)
