Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly Explained and Adapted to the Comprehension of Young Pupils |
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angle angle of incidence appear astronomy atmosphere axis ball called camera obscura Caroline centre of gravity centrifugal force circle cohesive attraction colours concave mirror consequently convex convex mirror degrees diminished direction distance diurnal motion earth eclipse ecliptick effect elastick electricity Emily equal equator explain figure fixed stars fluid focus force fulcrum geometry glass globe greater heat humour illustrate lens less lever liquids machine mechanicks mercury meridian metals moon motion move Natural Philosophy nature object obliquely observe opaque body opposite opticks orbit particles pass perpendicular planets plate poles pressure produced proportion pulley pump rays fall rays of light reflected rays refraction represents resistance retina revolve round right line rise round the sun shadow shines situated solar solid bodies sound space specifick gravity sphere spring substances sun's rays suppose surface tides tion tube understand vapour velocity vibrations weight whilst wind zodiack