Library of Useful Knowledge: Natural philosophy, Volume 2

action angle appear applied attraction axis ball battery becomes body called centre circle colours communication conductor consequence considerable considered construction contained continued copper described determined diameter direction distance earth effect electricity employed equal experiments extremity fall fixed fluid focus force former give given glass greater half hand heat inch increased influence intensity iron kind latter length lens lenses less light lower magnet manner means mercury metal motion move nature nearly needle object observed obtained opposite parallel particles passing piece placed plane plate pole portion position present prism produced proportion quantity rays received reflected refraction rendered represented respect result ring round seen separate side similar situated steel substance sufficient suppose surface theory thermometer thickness tion tube turned weight whole wire