Philosophia Britannica: Or, A New & Comprehensive System of the Newtonian Philosophy, Astronomy & Geomgraphy: In a Course of Twelve Lectures, with Notes, Containing the Physical, Mechanical, Geometrical, & Experimental Proofs & Illustrations of All the Principal Propositions in Every Branch of Natural Science. Also a Particular Account of the Invention ... of All the Considerable Instruments, Engines, & Machines ...
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Altitude Angle of Incidence Angle of Refraction apparent Magnitude appear Arch Axis Blue Body Cafe call'd Center Circle colour'd Colours condensed consequently convex convex Lens Degree Density Diameter Earth Ecliptic Ellipsis equal Equator Experiment Feet fix'd Fluid focal Distance Focus Force form'd Glass greater Heat Hence Hole Image Inches least refrangible Rays Length Lens means Medium Mercury Miles Mirrour Moon Motion Nature nearly Number Object Obliquity observed Orbit Parabola parallel Particles of Light perpendicular Place Planet Plate Point Pores Prism Proportion Pulses Quantity Quicksilver Radius Ratio Rays of Light reflected refracting Telescope Rings Semidiameter shewn shews Side Sine of Incidence Sir Isaac Sir Isaac Newton Sorts of Rays Sound Space specific Gravity Sphere Square Star String Sun's suppose Surface Thickness thro Tube Velocity Velocity of Sound Vibrations Violet Water Weight whence Wind
Page 179 - Light at one degree of obliquity fhould meet with Pores enough in the Air to tranfmit the greater part of it, and at another degree of obliquity mould meet with nothing but parts to reflect it wholly, efpecially confidering that in its paftage out of Air into Glafs...
Page 287 - It is to be noted, that the most luminous of the prismatic colours are the yellow and orange. These affect the senses more strongly than all the rest together ; and next to these in strength are the red and green. The blue compared with these is a faint and dark colour, and the indigo and violet are much darker and fainter, so that these compared with the stronger colours are little to be regarded.
Page 180 - Prifm placed at a greater diftance from the former, in fuch -manner that they are all alike incident upon it, the fecond Prifm may be fo inclined to the incident Rays, that thofe which are of a blue Colour fhall be all reflected by it, and yet thofe of a red Colour pretty copioufly tranfmitted. Now if the...
Page 52 - I myself have been one of five who have been together at the bottom in nine or ten fathoms water, for above an hour and a half at a time, without any sort of ill consequence ; and I might have continued there as long as I pleased, for any thing that appeared to the contrary.
Page 181 - ... from polifhed bodies could not be fo regular as they are. For in polifhing glafs with fand, putty, or tripoly, it is not to be imagined that thofe fubftances can, by grating and fretting the glafs, bring all its leaft particles to an accurate polifh, fo that all their furfaces fhall be truly plane or truly fpherical, and look all the fame way, fo as together to
Page 52 - ... their descent ; and to let it out again when they were drawn up full from below. And to a hole in the uppermost part of these barrels, I fixed a leathern trunk or hose well liquored with bees...
Page 182 - Now, if light be reflected, not by impinging on the folid parts of bodies, but by fome other principle, it is probable that as many of its rays as impinge on the folid parts of bodies are not reflected, but ftifled or loft in the bodies.
Page 182 - The Particles when they are shaken off from Bodies by Heat or Fermentation, so soon as they are beyond the reach of the Attraction of the Body, receding from it, and also from one another with great Strength, and keeping at a distance, so as sometimes to take up above a Million of Times more space than they did before in the form of a dense Body.