ed de- bably come into usein making artificial lights and Among the most zealous of the last-named class is scription of his invention :— signal lights. It occurs in several minerals and min- John Tyndal Esq., F. R. 8., Professor of Natural “Fig. 1, in the engraving, is a perspective eral waters,… … those whose periods of recurrence coincide with the them of fire-brick. The bark is burned in an oven, periods of oscillation possible to the atoms of the dis- connection with a spindle and driver, which are no and as the flame emerges it is carried through the flues part of the improvement, but…
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