Proceedings of the American Academy of Arts and Sciences, Volumen2Metcalf and Company, 1852 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Página 62
... pipes of lead have been long in use , and possess in an eminent degree most of the properties required for aqueduct service , and as the following researches have been more especially directed to ascertain the true value of leaden pipes ...
... pipes of lead have been long in use , and possess in an eminent degree most of the properties required for aqueduct service , and as the following researches have been more especially directed to ascertain the true value of leaden pipes ...
Página 63
... pipes ; and until about the commencement of the present century no experi- mental examination of the subject had been undertaken . Dr. Lamb of England , and later Guyton Morveau of France , devoted their attention for a time to this ...
... pipes ; and until about the commencement of the present century no experi- mental examination of the subject had been undertaken . Dr. Lamb of England , and later Guyton Morveau of France , devoted their attention for a time to this ...
Página 64
... pipes , before being laid down for service , should be exposed a length of time to solutions of some of the salts , denominated protecting ; having observed that leaden pipes , which poisoned certain waters when first served , after a ...
... pipes , before being laid down for service , should be exposed a length of time to solutions of some of the salts , denominated protecting ; having observed that leaden pipes , which poisoned certain waters when first served , after a ...
Página 65
... pipes for the transmission of water may be mentioned Drs . Chilton and Lee of New York , and Drs . Dana and Hayes of ... pipes . Croton River water , since 1842 , has been supplied through iron mains and leaden service - pipes to the ...
... pipes for the transmission of water may be mentioned Drs . Chilton and Lee of New York , and Drs . Dana and Hayes of ... pipes . Croton River water , since 1842 , has been supplied through iron mains and leaden service - pipes to the ...
Página 66
... pipes and iron mains , be as little liable to lead - disease as are the citizens of Philadelphia and New York who drink Schuylkill and Croton water similarly served , and that portion of the citizens of Boston who have for nearly a ...
... pipes and iron mains , be as little liable to lead - disease as are the citizens of Philadelphia and New York who drink Schuylkill and Croton water similarly served , and that portion of the citizens of Boston who have for nearly a ...
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Página 135 - August, and from them he infers ' that the changes in the elevation of the waters are entirely too variable to be traced to any regular permanent cause, and that consequently there is no perceptible tide at Green Bay which is the result of observation. And such, it appears to me, is the result of calculation, when the laws that regulate solar and lunar attraction are taken into view.
Página 135 - The phenomena occurred about noon. The day was calm, but cloudy. The water retired suddenly, leaving the bed of the river bare, except for a distance of thirty rods, and remained so for nearly an hour.
Página 137 - Beche, a sudden impulse given to the particles of water, either by suddenly increased or diminished pressure, would cause a perpendicular rise or fall, in the manner of a wave, beyond the height or depth strictly due to the mere weight itself. The difference in the specific gravity of the water of the lakes * American Journal of Science, Vol.