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absorbed acid action amount of heat antimony apparatus arrangement atoms attraction ball battery becomes bismuth body carbon chemical chlorine coil colour conductor connection continuous copper current passes decomposed decreases density direction distance earth effect electric current electric force electrified electroscope equal ether excited galvanic galvanometer gases given glass greater hydrogen inches increase latent heat length less Leyden jar light falling light passing liquid magnet magnetised means measure medium mercury metal mirror motion move needle negative nitric acid number of vibrations ordinary oxygen parallel particles passage piece plate platinum polarised pole position prism produce quantity radiation ray of light refraction repulsion result round side soft iron solid sound sound-wave spark specific heat spectrum string sulphuric acid surface temperature theory thickness tion tricity tube velocity velocity of sound weight whole wire zinc
Page 54 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.