'4 



Humphry Davy, to whom we are inaeDted for, the, l^rsj^ 

 cpLrrgct.^.jiq|i,0Eij5, Ofi,,^?,j ft&M<? af .^.aojg^ '^ fl#?^? i*^ ■ .iP '^e 

 **-,3je"^(o^;qr, .ga^ep^s pqit^rj he£^t,e4, t^'^ja'pli .i^^fl^'gij^e) aSjtq , ;be! 

 lun^fio^B^j flapaes are conical, -P!Bca,use tte :gre^test'hi^^t i? iiif 

 tj^l^iceptr^ , pf/the, i^iaasj^^ ^ aftd, .J^ecaUSje heated; aijf r?ip,yiy ^-sc^.D^f, 

 thrfiugji pqpjev, jaif^" , . ,tli§ .^b^at, '9^, JQ^ipie; /^ ' prop.of tjonai t^ ' j yj^ 

 rapidity; ^ <^, cojpn,l^natio;;ij( .aod , .thie , '^^sity i jpf;-. th;^ ga^e^ '. COIIIt, 

 biqiQg;^,,t)iu^ it'dinaijiishfes, i)y i5afe^a,ctjQiij and Ipcrej^Sies ,^y,cppT^ 



lor its combustion, it will be easily extinguished' by rare faction, , 

 qr 3 Ipofyc^^lliig^. i^g^n^ie^ ;, if. it j-equive^ a jvety, , Ipw. , ,ten)per'£^ture' 

 ajpj[y,,4^iyyill ■b\^rtt i(i Jiigjbljiirs^rjfiecl ,£tir^ pr'irunije^'.c^onsi^V^tle, 



cp9jing,^gencies, io^y.-.U.'.n^ Ln'odih huii 'l^U^ial^'-uU'a^^^a 

 ,,C!rafikeS;l,b^t bi:^n,,Yyiitfa.,^i|^^.ulty,,, j^f^^ ke^p/} jj> ^.stp.t|?:^f{ 



continued inflammation if j.ibhey.pg.^stij'pngly heate^^l^aflid; Vt^c^ 

 nt^pri^i.pf j^afe,ty;|fiaip| canno^t ^te too sensibly impr^sed; witb 

 t^|j;iPpn^equences ;\vhjch flovy, , from, this property, .^or ,"^,.if, 

 Tfti^inres pf fire-damp , : ^re !|)iir^t. . Irpm, systems > \ o^ Ijub^^.'.jP^ 

 canala, . or raetallic plates,, ,w,lij9]p[ tav€5^$p:f9,ll, radj,aUpg, ani^ 

 CiPpling , s)}iffic^f tkqugkj^^ ^^qfe,Jft^,j(^r,st^ .^t(tey 



become jianget-ous , as ■th^y .are heated,* wlier6 , currjejiit^j are 9Bfif>)7j 

 si<?|i^jql w)wc!i[ cqnpentrate;?xp|osiye,mi4^iurei^ by tKe,airvfRe^pi!^ 

 ir^'lapps b^ipg below* -ana, made in thicK-'metatlfp p]at,es p^ipj 

 c^^s, /there being ^341 incr^inent; of. be;at ^jvithip, iapd. a v^jry^ 

 s^ali r^piw^g ^P'^fape/jwithpiAy ^^tt^ ^^flrf, tnf^ea^es, (Ae jCe^-^ 

 bus,t:{on ,oJ] the i,efja/^siq«" mi^chire 4(iu( gr(id,u^Ily exlie^d.jiMrffiej'tj 

 afld fft- J^st icommmifate explosion^ (w/4, 



be,,ffimn)^iica.tMbMi^'^^y'-9^^^K^f fiomvjer, smalt, pfyj-^i^i^^^jiitj^.D^ 

 siifficifintlyiheated." . .^ . .^ ' ; ;»/ ^- ; ;o 



i;;",sjjirire:gavi^e, as itpflers a greater extent^ of radiating surf,, 

 fajs^n'tii^iT^ppifofated metallic plates is the pest , material for^ 

 tbe guard of jamps ; and by being naade of the propei; degree, 

 'of fineness, it will form a barrier fpu every species pt ^xplosiofij 

 reigujiripg- tempeTatures.j .higber jtljan those of ouf f^f.rapgpliei|'e ; 

 but th^'apertvire^ ip^ust; be smaller, and the radiating surfacpsr 

 greater, in proportion ^•o the inftaramabi.lityoi'.thie gas;^an(lj 

 currents. ,pf explpsiy e mixtures, acting even ,ifor, 3> ^engtn jQf|t^e, 

 may be; stopped by reduplications of wlrp gauze. Wire gau?p:j 

 fofilamps must nojt.be tnade of, ppi: cpvered witji, ,|iny^^asiJy, 

 cpmbiistiibjeime^j ; .fine bras^; wire ijs, jmproper;,; ,prt acppunt pf, 

 tbe»^§*PjLii|;<?ppjl#ip^,5and tbe,ifpn , wif<? .s|>o^l(^^'njDt t>,e .tin)0,e(i^j 



^."'fwarn t^ie Wal' hvlne^," says'Slir' 'Jf'uii'iphry'' agaiAst any'pretended safety' 

 Iift&t» tAad^{^'t'(iis<Bittdnta\' biJd i»^h^ totstiptoncKtl obsMT»i,,jafry^ip|iew to be coiiK> 

 ftructtd upon principles of scciuity, but in which these principles citnnot really exist." 



