Recreations in Mathematics and Natural Philosophy ...G. Kearsley, 1803 |
المحتوى
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
anemometer angle aperture apparent magnitude appear axis ball blue body bottom camera obscura catoptrics centre of gravity circle colours concave mirror consequently constructed convex convex lens curious cylinder denarius diameter direction ditto divided drawn effect employed equal experiment extremity eye-glass facet feet figure fixed focal distance focus give globule greater hole horizontal inches inclined plane invention kind last place latter length lens less light machine magnified manner means mechanism method microscope motion move moveable necessary Niceron object glass obolus observed optical painted parallel pass perpendicular perpetual motion piece piston plane mirror position pounds principle PROBLEM produced proportion radius raised ratio rays reflected reflecting telescopes refraction represented retina seen shew side sound specific gravity spherical square stance steam stick suppose surface telescope tion Troy weight tube turn velocity vertical vessel vibrations weight wheel