Wright, Mark R., 1854- · London : Longmans · leaf 59
Fig. 39. light. At one focus (fig. 39) a hot ball n is placed, at the othera piece of phosphorus, m, which is at once ignited. Point onemirror to the sun, pieces of wood and paper can be readilyignited at the focus. As the result of experiments substances have been arranged Transmission of Heat S i…
Physics
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