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)
ated. For instance, with a lens theheat of the sun will ignite combustible substances, but the same quan-tity of solar heat, after being absorbed by a blackened wall and thenradiated, cannot be brought to that degree of intensity necessary toignite the same substances. For the same reason solar… … so that one extremity will abut against tlie short arm of the lever, A,when it stands in a vertical position; then secure the other extremityby the clamp-screw li. When the rod is heated, by lighting the lamps,it will expand; and the extent of expansion will be indicated by themovement of the long…
Physics · Astronomy
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