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<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:h="http://www.hathitrust.org" lang="en" xml:lang="en" version="XHTML+RDFa 1.0"> <head profile="http://www.w3.org/1999/xhtml/vocab"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link about="[_:uc1.b3728192]" rel="foaf:isPrimaryTopicOf" href="https://hdl.handle.net/2027/uc1.b3728192" /> <title>The philosophical magazine, ser.5 v.17. - Text-only - Full View | HathiTrust Digital Library</title> <meta name="viewport" content="width=device-width, initial-scale=1" /> <link rel="stylesheet" href="/common/alicorn/css/main.201910.css" type="text/css" /> <link rel="stylesheet" href="/ssd/ssdstyles.css" type="text/css" /> <script src="/common/alicorn/js/utils.201910.js"></script> <script src="/ssd/access_banner.js"></script> <script src="/ssd/toc_links.js"></script> </head> <body><div id="mdpUberContainer"><div id="mdpHeaderContainer"><div id="mdpPageHeader"><a name="top" id="top"></a><h1>The philosophical magazine, ser.5 v.17. | HathiTrust Digital Library</h1><p><a style="font-weight: bold" href="https://hdl.handle.net/2027/uc1.b3728192?urlappend=%3Bseq=170"> View this item in the Book Viewer </a></p><p>Use of this online version is subject to all U.S. copyright laws. Please do not save or redistribute this file.</p><div id="SSDcontact">For questions or comments, contact HathiTrust.org at <a href="mailto:support@hathitrust.org">support@hathitrust.org<br /></a></div><div><p>You have one page at a time access to this item. Authenticated members of HathiTrust institutions who have a print disability may have full-text access to this item. <a href="http://babel.hathitrust.org/cgi/wayf?target=https%3A%2F%2Fbabel.hathitrust.org%2Fcgi%2Fssd%3Fid%3Duc1.b3728192%3Bseq%3D170%3Bnum%3D148" id="loginLink"> Login</a> to determine if you have access and see all volumes that are available when searching. For more information, see <a href="http://www.hathitrust.org/accessibility">HathiTrust Accessibility</a>. Page at a time access to this item is also available via our fully-styled HathiTrust interface.</p></div><div id="SSDjumps"><a href="#biblio">Go to full bibliographic information</a><br /><a href="#toc">Go to table of contents</a><br /><a href="#SkipToBookText">Skip table of contents and go to current page</a></div><div id="mdpItemMetadata"><h2><a name="biblio" id="biblio"></a>Full Bibliographic Information</h2><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Title</div><div class="mdpMetaText"><span about="[_:uc1.b3728192]" property="dc:title" rel="dc:type" href="http://purl.org/dc/dcmitype/Text" content="The philosophical magazine, ser.5 v.17.">The philosophical magazine, ser.5 v.17.</span></div></div><div xmlns:METS="http://www.loc.gov/METS/" xmlns:PREMIS="http://www.loc.gov/standards/premis" id="mdpFlexible_1"><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Published聽</div><div class="mdpMetaText"><span property="cc:attributionName" rel="cc:attributionURL" href="https://hdl.handle.net/2027/uc1.b3728192" content="London, England :Taylor &amp; Francis,1798-c1977."></span><span property="dc:publisher" content="London, England :Taylor &amp; Francis,1798-c1977.">London, England :Taylor &amp; Francis,1798-c1977.</span></div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Description聽</div><div class="mdpMetaText">v. :ill. ;25 cm.</div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Rights聽</div><div class="mdpMetaText"><a target="_blank" href="http://www.hathitrust.org/access_use#pd-google">Public Domain, Google-digitized. </a></div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Permanent URL聽</div><div class="mdpMetaText"><a href="https://hdl.handle.net/2027/uc1.b3728192">https://hdl.handle.net/2027/uc1.b3728192</a></div></div></div></div></div></div><div id="ControlContentContainer"><div class="mdpControlContainer"><div id="mdpContentsList"><p></p><h2><a name="toc" id="toc">Table of Contents</a></h2><ul><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=1;num=">Front Cover</a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=7;num=i">Title Page<span> on page number i</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=9;num=iii">Table of Contents<span> on page number iii</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=15;num=1">Section 1<span> on page number 1</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=38;num=24">Section 2<span> on page number 24</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=46;num=30">Section 3<span> on page number 30</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=64;num=46">Section 4<span> on page number 46</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=77;num=59">Section 5<span> on page number 59</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=87;num=69">Section 6<span> on page number 69</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=93;num=75">Section 7<span> on page number 75</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=100;num=82">Section 8<span> on page number 82</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=129;num=111">Section 9<span> on page number 111</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=137;num=119">Section 10<span> on page number 119</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=155;num=135">Section 11<span> on page number 135</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=164;num=142">Section 12<span> on page number 142</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=170;num=148">Section 13<span> on page number 148</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=177;num=155">Section 14<span> on page number 155</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=178;num=156">Section 15<span> on page number 156</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=187;num=163">Section 16<span> on page number 163</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=197;num=173">Section 17<span> on page number 173</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=213;num=188">Section 18<span> on page number 188</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=220;num=194">Section 19<span> on page number 194</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=244;num=214">Section 20<span> on page number 214</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=271;num=239">Section 21<span> on page number 239</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=277;num=245">Section 22<span> on page number 245</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=283;num=249">Section 23<span> on page number 249</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=299;num=265">Section 24<span> on page number 265</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=309;num=275">Section 25<span> on page number 275</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=316;num=282">Section 26<span> on page number 282</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=338;num=302">Section 27<span> on page number 302</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=352;num=314">Section 28<span> on page number 314</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=359;num=321">Section 29<span> on page number 321</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=366;num=328">Section 30<span> on page number 328</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=392;num=352">Section 31<span> on page number 352</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=407;num=367">Section 32<span> on page number 367</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=417;num=377">Section 33<span> on page number 377</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=432;num=392">Section 34<span> on page number 392</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=438;num=398">Section 35<span> on page number 398</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=445;num=403">Section 36<span> on page number 403</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=451;num=409">Section 37<span> on page number 409</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=480;num=438">Section 38<span> on page number 438</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=489;num=447">Section 39<span> on page number 447</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=501;num=459">Section 40<span> on page number 459</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=533;num=487">Section 41<span> on page number 487</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=540;num=492">Section 42<span> on page number 492</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=559;num=507">Section 43<span> on page number 507</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=617;num=565">Index<span> on page number 565</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=624;num=">Section 44</a></li></ul></div></div><div id="mdpContentContainer"><a name="SkipToBookText" id="SkipToBookText"></a><h2 id="seq170">Section 13 - Page 148</h2><div id="mdpPage"><p class="Text">148 Prof. Tyndall on the White Rainbow. mountains. Probably the conditions for such an observation do not exist on the earth's surface. In conclusion, I may be allowed to express my regret at not being able to make a contribution of positive value to the investigation of this subject. The state of the question is about this:-A well-founded theory of terrestrial temperature can be built only upon an accurate knowledge of the laws of emission and absorption of radiant energy of different wave- lengths, especially in the atmosphere, and the result will appear as a numerical calculation, more or less exact, of the temperature resulting from assigned conditions, and not as the conclusion of an argument to show one thing or another. XIX. Note on the White Rainbow. By JOHN TYNDALL, F.R.S.* THE HE highest portion of Hind Head Moorland, which is close to the spot where I now write, is about 900 feet above the sea. Over this high plateau, at the present season of the year, mist and fog frequently settle. This has given me of late frequent opportunities of observing, on dark nights, the white circular bows described in my last brief communi- cation to the Philosophical Magazine. All fogs are not able to produce these circles. What is usually known as "Scotch mist" appears eminently suitable for this purpose. Last Christmas Day was heralded by mist and fog of a very dense character. Both, however, became thinner as the day advanced; and finally a blue sky overarched the moorland. Accompanied by my wife I walked out upon the common. When facing the sun we noticed the air alive with small glistening specks. They were an obvious residuum of the fog, produced probably by the coalescence of its smaller particles to minute drops. My previous experience led me to infer that these specks or globules must be able to produce some kind of rain- bow. The inference was immediately verified. Turning my back to the sun, and looking across the Devil's Punch Bowl, a well-defined white bow was seen spanning that remarkable basin. The sky above us was blue at the time, the fog had disappeared, and nothing which could be properly called rain existed in the atmosphere. Circular bows are sometimes seen on looking from the edge of a precipice into an abyss filled with fog. But the precipice, though useful, is not necessary, as the following observation shows. Standing upon the common, with a perfectly level area of dark heather in front of us, and watching with the * Communicated by the Author. </p><p><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=169;num=147"> Previous Page </a><br /><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=171;num=149"> Next Page </a><br /> Return to <a href="#top">top</a>. </p></div></div></div></div><script type="text/javascript">var gaJsHost = (("https:" == document.location.protocol) ? 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