## The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1922 |

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Page 581

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**integral**I = fds has an extreme or minimum value ( zero ) when extended over a light - ray . For this reason , these lines of zero length are known as ...**integral**, the**integral**Ray of Light in the Solar Gravitational Field . 581.Page 582

difficulty may be overcome the arc

difficulty may be overcome the arc

**integral**, the**integral**by considering , instead of § ( 9mn xm ' xn ' ) dr . I ( a ) = f ( dr ) dr = √ ( guni'n S No matter what the parameter 7 is , this has an extreme value ( zero ) when extended ...Page 1017

If we now let S recede to infinity , the surface

If we now let S recede to infinity , the surface

**integral**may vanish in that case we have the usual expression , $ = = SIS [ 2 ] dτ , t the**integral**extending throughout all space . · ( 8 ) In any case the surface**integral**expresses the ...### Contents

SIXTH SERIES | 1 |

Profs J N Brønsted and G Hevesy on the Separation of | 31 |

Mr A R McLeod on the Lags of Thermometers | 72 |

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absorption amplitude angle anode apparatus approximately arc flash argon atoms axis basilar membrane boron bulb calculated carbon cathode centre charge circuit coefficient constant corresponding crystal cube curve deflexion density determined dielectric constant direction discharge displacement distance effect electric field electrons element emission energy equal equation experimental experiments fluorescence force formula frequency function galvanometer gases given helium hydrogen increase integral intensity ionization isotopes layer liquid magnesium magnetic means measured mercury metal method molecular molecules nitrogen observed obtained oscillation P₁ paper phase Phil phosphorus plane plate positive potential pressure quantity radiation radius ratio rays reflexion rhodamine shown in fig solution spark lines specific heat spectrum surface surface tension temperature theory thermometer tube vapour velocity vibration volts water arc wave-length wire zero