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 appear astronomy atmosphere attraction axis ball body called Caroline cause centre circle cohesion colours common consequently consider consists contain continue course dark described diminished direction distance draw earth effect electricity Emily equal equator experiment explain fall figure fixed fluid focus force give glass globe gravity greater heat hour idea illustrate increased kind length lens less lever light liquids machine manner matter means meet metals mirror moon motion move nature object obliquely observe opposite orbit particles pass planets plate poles pressure produced properties proportion pump quantity raised rays rays of light reason reflected refraction represents resistance retina rise round seen shadow side situated solid sound space spring stars substances suppose surface tides tion true tube understand velocity vibrations weight whole wind