382 NÍUNDA ATRIÐI. 30 ferhyrníngsfeta stórri bla&atinshúS á, þá hitnar hann töluvert, af því ab hann er of mjór til þess, ab geta einsog losafe sig nógu fljótt viB svo mikib rafurmagn, sem þá berst aö honum. þaö er og ekki dæmalaust, aö þráÖurinn hefir þá bráönaö og slett dropunum út frá sér á alla vegu, eins og sjóöanda járn. Dálítiö högg gjörir ekki neinn fjarskalegan hita á járnþræöinum. Heffei nú 3 eÖa 4 þumlúnga laung og örmjó blaöatinsræma veriö fest á milli kúlnanna d og /, þá mundi hún hafa horfiö burtu og oröib aö gufu (gufaö burtu, rokiö upp), gufan aptur kalkazt (oxyderet, iltaztT), og svifiö um í lausu lopti og myndaÖ allt eina þræöi, ekki ólíka kóngulóarvef. Enn ööruvísi heföi þetta oröiö, ef vér heföum haft gullvaf&a silkiþræöi á milli kúlnanna d og /. þegar þeir eru öörumegin stroknir aö endilaungu meö hvítu bréfi, þá sýna þeir berlega hrafea þann, sem rafurmagnshöggiö flýgur meö eptir efnispörtum hins leiöanda líkama. GulliB gufar þá upp og kalkast (iltast), en bréfiB fær á sig gulleita rák. Silkiö er eins eptir og áöur. Viö allar þessar tilraunir hitna góÖir leiö- endur miklu betur en slæmir, og því meira sem þeir eru betri. Meö aflermanda Henleys má og láta rafurmagnsneistana gjöra gat á glerflögu. Menn taka þá tvo títuprjóna og festa þá þannig sinn hvorumegin viö glerllöguna meö vaxi, aö oddarnir stefni hvor á móti öörum. SíÖan er þessi umbúníngur settur á milli kúlnanna d og / á affermandanum, á þann hátt, aö prjónahöfuöin snerta sína þeirra hvort. þar sem neistinn kemur á gleriö, sést ekkert á því aö utanveröu. Höggiö af meöallagi stórum rafurmagnskastala drepur bæöi fugla, héra og önnur smádýr á einu augnabragöi. Af þesskonar dýrum hefir rafurmagnshöggiö einna minnst áhrif á hýöisorminn (Larve~)i og drepur þaö hanu ekki. Jarfinn (Fielfras) þolir jafn- vel aö veröa fyrir höggum Iopts-rafurmagnsins, og fer opt og einatt feröa sinna upp og ofan um eikur þær, sem skruggu-eld- íngum slær niöur í. Ekki hafa menn enn komizt eptir ])ví, aö limir dýranna aflagist neitt eöa skemmist viö þaÖ, þó þau hafi látiö líf sitt fyrir rafurmagnshöggi. Hinn frægi náttúrufræöíngur van Marum í Hollandi tók 4 þumlúnga háfan og viölíka digran buxviöarkubb sívalan og dró látúnsþræÖi í gegnum möndul hans. Síöan lét hann rafurmagns- neistann hrökkva á þessa þræöi, og þá jafnframt fara í gegnum

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