ions to a large class the oxyhydrogen lime-light or an arc-lamp may be needed. In many experiments the filament of an incandescent lamp affords amost satisfactory luminous object; if necessary a shade can be fixed overthe globe so as to prevent the passage of light from all except the… … and plac? it at a distance of 2 or 3 metres from a wall. Cuta square or triangular piece of card A BCD and place it in astand between the light and the wall with its plane parallel tothe wall. A shadow ABCD is cast on the wall. This shadowis of the same shape as the cardboard and is such that, if…
Heat · Light
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