詹姆士·瓦特和水壶（2）

    this randmother ing. the inning to bubble. a thin cloud of steam  from the spout. soon the lid began to rattle and shake. the hot vapor puffed out at a furious rate. yet .

    “grandma,  but  else. there is something in there that lifts the lid and makes it rattle.”

    the grandmother laughed. “oh, that is only steam,” she said. “you can see it coming out of the spout and puffing up under the lid.”

    “but you said there  but et under the lid?”

    “randmother inning to feel puzzled.

    the lad lifted the lid and peeped inside again. he could see nothing but the bubbling  to lift the heavy iron lid. grandma, ho, reat deal of reat deal stronger? reater ht? randmother made no reply. these questions of je’s  than profitable, she thought. she s than rattle the lids of teakettles—that ht about it, and evening after evening he sat by his grandmother’s fireside and  black throat of the chimney. the idea grere study he began to reason upon it to some purpose.

    “there is a iant th. if s it might do for us.  it hts, but it ons, it  alongside of this po that it might be made their servant. but hoain and again, but from each failure he learned something nehed at him. “hoive to the ine. thus, from the study of so simple a thing as a common teakettle, the most useful of all modern inve-ntions was finally produced.</p>

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