Boston Journal of Philosophy and the Arts: Intended to Exhibit a View of the Progress of Discovery in Natural Philosophy, Mechanics, Chemistry, Geology and Mineralogy, Natural History, Comparative Anatomy and Physiology, Geography, Statistics, and the Fine and Useful Arts, 2±ÇCummings, Hilliard, & Company, 1825 |
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431 ÆäÀÌÁö
... Paratonnerre * is a conductor which the electric matter of the lightning prefers to the surrounding bodies , in order to reach the ground , and expand itself through it : it commonly consists of a bar of iron elevated on the buildings ...
... Paratonnerre * is a conductor which the electric matter of the lightning prefers to the surrounding bodies , in order to reach the ground , and expand itself through it : it commonly consists of a bar of iron elevated on the buildings ...
432 ÆäÀÌÁö
... paratonnerre , than if its extremity were rounded ; at least electrical experiments lead to this conclusion . Thus the most advantageous form that can be given to a paratonnerre appears evidently to be that of a very sharp cone . The ...
... paratonnerre , than if its extremity were rounded ; at least electrical experiments lead to this conclusion . Thus the most advantageous form that can be given to a paratonnerre appears evidently to be that of a very sharp cone . The ...
433 ÆäÀÌÁö
... paratonnerre , but as its stem must rise from 15 to 30 feet above the build- ing , it would not be of sufficient strength at the base to resist the action of the wind , unless it were made much thicker at that part . An iron bar about ...
... paratonnerre , but as its stem must rise from 15 to 30 feet above the build- ing , it would not be of sufficient strength at the base to resist the action of the wind , unless it were made much thicker at that part . An iron bar about ...
434 ÆäÀÌÁö
... paratonnerre , on the contrary , well connected with the ground , presents a certain security against the lightning , which will never leave it to strike a person at its foot , though it would not be prudent to station one's self close ...
... paratonnerre , on the contrary , well connected with the ground , presents a certain security against the lightning , which will never leave it to strike a person at its foot , though it would not be prudent to station one's self close ...
435 ÆäÀÌÁö
... paratonnerre is fixed on the roof of buildings , according to circumstances . If it is to be placed above a rafter , the ridge must be pierced with a hole through which the foot of the stem passes , and is steadily fixed against the ...
... paratonnerre is fixed on the roof of buildings , according to circumstances . If it is to be placed above a rafter , the ridge must be pierced with a hole through which the foot of the stem passes , and is steadily fixed against the ...
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