Library of Useful Knowledge: Natural philosophy, Volume 2

acid action appear ascer attraction axis ball battery body boiling point centre centre of gravity circle colours compass conductor convex convex lens copper cylinder degree diameter direction distance earth effect elec electric current electric fluid electroscope equal experiments Fahrenheit fixed focus force galvanic glass Gloss gravity greater heat horizontal hygrometer inch induction instrument intensity iron length lens lenses lever light liquid magnet ment mercury meridian metal motion move needle Newton north pole object obliquely observed opposite parallel particles passing perpendicular phenomena piece placed plane plate polarity portion position prism produced proportion pyrometer pyroscope quantity rays reflected reflecting telescope refraction refrangible rendered repulsion result retina right angles ring round scale side south pole steel substance surface telescope temperature theory thermometer thickness tion tricity tube velocity vertical voltaic weight wire zinc