Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
surface at the middle point. 172 HEAT AND STEAM-ENGINE. In accordance with the laws jnst explained, rays of heat, as well as raysof light, parallel to the axis of such mirrors, will be reflected to a singlepoint, called the focus of the mirror; and, conversely, rays radiatingfrom the focus will be… … cannon-ball in the focus, T, of the other mirror. As indicated by thelines, arrows, and smoke, the heat from the ball, T, will be reflectedfrom the left-hand mirror to the right-hand mirror in parallel lines,and again reflected to the cup, igniting the phosphorus. The mirrorsmay be several yards…
Physics · Astronomy
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