Penny Blood: Serial Sensation and Working-Class Entertainment — page 246: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

cH. xvi] THEORY OF VOLCANIC ENERGY. 229 of the plunger must have been rendered much greater by the cube of rock having been free to fall asunder on all sides. If it had been confined in a box of its exact size it might still have been crushed; but the amount of descent would have been in that case dependent solely upon the increase of density which could be given to it after disintegration by the pressure. If the box had been somewhat larger, the plunger would have de- scended further, and if the rock was altogether unsupported, as seems to have been the case, further still. The value of (the heat) found in accordance with the experiment is correct; but the form of the experiment cannot represent at all closely what would happen deep in the earth’s crust. It seems that the cubes should have been confined, that the experiment might more closely represent the case of nature. But accepting the results as given, the equation connecting the quantities involved may be thus arrived at. Let W= the pressure laid upon the plunger. h =the height through which the plunger descended. J = Joule’s equivalent, or the number 772. H =the number of units of heat into which the work of crushing was transformed. Also, ¢ =the temperature through which the rock was raised by the crushing. =the specific heat of the rock, t.e. the number of units of heat requisite to raise 1 lb. of rock through 1° F. = quantity of heat requisite to raise w of rook 1 w ; ts = quantity of heat requisite to raise w of rock 0° w _ wy Hence _ i sw GOR GIOo SS (CO)