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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=451"> 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%3D451%3Bnum%3D409" 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="seq451">Section 37 - Page 409</h2><div id="mdpPage"><p class="Text">Intelligence and Miscellaneous Articles. 409 position of the axis. The angle i' is found by measuring b on the divided circle. Twelve observations, by this method, made at the end of the year 1881 and at the beginning of 1882 by three dis- tinct observers, gave the result Induction-compass - dip-needle (Dover)=0' 50"+9". The result is thus almost the same, and it will be found that the accuracy of the method leaves nothing to be desired. Moreover a complete determination requires less time than with a dip-needle. The researches will still be prosecuted with modified apparatus, and particularly with smaller ones.-Comptes Rendus, January 14, 1884. ON THE HEATING OF IRON BY DISCONTINUOUS MAGNETIZATION. BY J. BORGMANN. It follows from the experiments of Joule, Van Breda, Grove, Edlund, Petruschewsky, Jamin and Roger, Villari, Cazin, Herwig, and Trowbridge, that heating takes place in iron when it is exposed to continuously interrupted magnetization. These experiments nevertheless leave it open to doubt whether the heating in question is a direct result of the magnetization, or whether it is simply the result of the development of induction-currents in the mass of the iron when the magnetization is interrupted. To solve this ques- tion, the author made a series of simultaneous experiments with iron and copper tubes of equal dimensions and under the same conditions. Two glass tubes, 500 centim. in length and 4.5 centim. in the clear, formed the reservoirs of air-thermometers; in one glass tube was placed copper tubes slit lengthwise, and in the other iron tubes also slit. The increase of temperature of the air in these glass tubes was determined by the sinking of the naphtha in the two limbs of a manometer in comparison with the level of the naphtha in a third limb; the latter was connected with a reservoir of great capacity, which was immersed in a large vessel of water in order to eliminate the influence of the pressure of the air. These glass tubes were surrounded by others of the same length but larger diameter. The space between the tubes was filled with run- ning water of the temperature of the room. The reservoirs thus constructed were placed inside magnetizing spirals made of stout copper wire (2 millim. diameter and 540 turns) coiled on thick paper tubes. The magnetizing spirals were surrounded by induction- spirals of fine wire. These spirals could be alternately connected by means of a commutator with a Weber's electrodynamometer. The two magnetizing spirals and the two induction-spirals were exactly alike. Both spirals were inserted in the common circuit of a battery of 4 to 10 Poggendorff's elements. The breaking, and change of direction of the magnetizing current, were effected by special commutators which were constructed like those in the Gramme machine, and were moved by a clockwork by Eichens. By means of this commutator the current could be opened 5, 10, 20 times in a second, or its direction could be altered as often. From Phil. Mag. S. 5. Vol. 17. No. 107. May 1884. 2 E </p><p><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=450;num=408"> Previous Page </a><br /><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=452;num=410"> 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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