. The Family tutor . 66 NATURAL PHILOSOPHY. Fig. 38, the hammer, b, of which can be moved on its pivot, c, by means of a lever,h, which is worked by a rod passing through the stuffing-box, bell is placed on a leather drum, /, and fastened down tothe pump-plate by means of a board, d. While the air is yetin the receiver, the sound is quite audible, but on exhausting, itbecomes fainter and fainter, and at last can no longer be readmitting the air the soundgradually increases, and at last ac-quires its original intensity. Theleather cushion,/, is necessary to pre-vent the transmiss
. The Family tutor . 66 NATURAL PHILOSOPHY. Fig. 38, the hammer, b, of which can be moved on its pivot, c, by means of a lever,h, which is worked by a rod passing through the stuffing-box, bell is placed on a leather drum, /, and fastened down tothe pump-plate by means of a board, d. While the air is yetin the receiver, the sound is quite audible, but on exhausting, itbecomes fainter and fainter, and at last can no longer be readmitting the air the soundgradually increases, and at last ac-quires its original intensity. Theleather cushion,/, is necessary to pre-vent the transmission of the soundthrough the solid part of the pump. The air also is absolutely neces-sary for the support of life. Thehigher warm-blooded animals die whenthe air is only partially rarefied. Arabbit, or other small animal, placedjar may remain there several minutesbut if we commence with-
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