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210
MIRACLE-MONGERS AND THEIR METHODS
B is a feather bed upon which the performer falls.
The posture of Fig. 4 Plate 19 (where the strong man having an anvil on his breast or belly, suffers another man to strike with a sledge hammer and forge a piece of iron, or cut a bar cold with chizzels) tho' it seems surprising to some people, has nothing in it to be really wondered at; for sustaining the anvil is the whole matter, and the heavier the anvil is, the less the blows are felt: And if the anvil was but two or three times heavier than the hammer, the strong man would be killed by a few blows; for the more matter the anvil has, the more inertia and the less liable it is to be struck out of its place; because when it has by the blow received the whole momentum of the hammer, its velocity will be so much less than that of the hammer as it has more matter than the hammer. Neither are we to attribute to the anvil a velocity less than the hammer in a reciprocal proportion of their masses or quantities of matter; for that would happen only if the anvil was to hang freely in the air (for example)
