& ball apparatus for bitumen testing - this apparatus is used to determine softening point of bitumen. it is that temperature at which a sample of bituminous material loaded by a . mm dia steel ball, drops a specified distance when heated under specified conditions. the apparatus consists of steel bracket...
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which bell hoped would transmit the human voice by telegraph . henry replied that bell had "the germ of a great invention." when bell said that he did not have the necessary knowledge, henry replied "get it!"...