John Poynting citáty | Citáty slavných osobností

John Poynting: 2 citáty0 lajků

John Poynting: Citáty anglicky

“When we see the havoc wrought on a sea-wall by a storm, it is easy to believe that ocean waves exert a pressure against the shore on which they beat. But it is not easy to think that the tiny ripples of light also press against every body on which they fall, to think that when a lamp is lighted waves of pressure are sent out from it—pressing against the source from which they start, pressing against every surface which they illuminate. It is a very minute pressure, far too small, even when it is strongest, to be felt by our bodies, and only to be detected by exceeding sensitive apparatus.”

Help us translate this quote

John Henry Poynting

[The pressure of light, 1910, London, Society for Promoting Christian Knowledge, 9, https://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t87h1gt3q;view=1up;seq=13]

“A very simple experiment shows that a black surface is a better radiator, or pours out more energy when hot, than a surface which does not absorb fully, but reflects much of the radiation which falls upon it. If a platinum foil with some black marks on it be heated to redness, the marks, black when cold, are much brighter than the surrounding metal when hot; they are, in fact, pouring out much more visible radiation than the metal.”

Help us translate this quote

John Henry Poynting

[Smithsonian Report for 1904, 185–193, Radiation in the solar system, https://books.google.com/books?id=2G1xpr2w4PUC&pg=PA186] (p. 185)

Podobní autoři

Pierre Curie1

francouzský fyzik None

Charles Caleb Colton9

britský kněz a spisovatel None

Charles Darwin25

britský přírodovědec None

Charles Spurgeon142

britský kazatel, autor a pastor None

Benjamin Disraeli50

britský konzervativní politik, spisovatel, aristokrat a pre… None

Charles Dickens32

anglický spisovatel a společenský kritik None

Thomas Carlyle50

skotský filozof, satirik, esejista, historik a pedagog None

Jane Austen96

britská spispvatelka None

Robert Southey6

britský básník None

Emily Brontë13

anglická spisovatelka a básnířka None