36 CHEMISTRY AND INI)USI'I1Y .Inti. 12, 1031

osidntion a t the niiodc with incrcnsc of carbosy~\ nectcd, by n sliort IcngtIi of riibI)cr triI)ing crirryiug a spring clip, t o i~ supply of distilled water ; thc esit tubc of n wnsli bottle is convenient for the

groups. 'rile nnnlogy l)et\vccn elcctro-polynierizctl shellac niicl blcaclicd Inc with rcgnrtl to osidation is fiirthcr boriie out in the lowring of iotliiic vnlues in both cnscs.

Elcctro-tlcposition of slicllnc liiis possibilities of widc :ipplication. ISspcrimciits :ire in progress for olitaiiiing insulnt ing contiiigs on inctnl surfircc by sitliultiiiieoris clcctro-tlepositioii of ruhbcr ant1 sliell:ic from a iiiisture of tlieir iilknline solutions. Tlic possi- bility of recorering slicllric from wiistc prodiicts will also be investigated.

A dctiiilcd account of this invcstigntion will he publishctl shortly.

A VESSEL FOR ACID-ALKALI TIT RATIONS

By J. JACKSON, BSc.

The ripprirritus f'or titrritioiis using ~~heiiolplitlinlci~i as indicator, consists of r~ 150-c.c. or 200-C.C. wide- ~iioutlied ~01iici11 flask, t lie cork or rubber stopper of \vliicli comics n gliiss t uhr (0) of' iil)out A-in. tlitunctcr,

and one of narrow horc (If) bent ns in the dingram. Two side tubes (rl iiritl C) iire sciilctl into the wider tiibc, to tlic iippcr end of \vliicli a sliort piece of nrrrrow riilil~cr tubing is sccurctl I J ~ ono or two turns of thin wire. 'l'liis provides ti lion-rigid sen1 wibli t,lic tip of tlic burcttc. '.I'hc tube ( A ) is con-

purposc. 'I'he tiibc ( B ) is connectctl to II sodii lime tube, niitl tube (C) to II filter piiinp, iind :I gcntle strcani of air is drawn througli tlic :ipp:irritw. 'I'oivnrds the end of tlic titrntion the flrisk: noriiirilly licltl just above the ImicIi, is nllo~vetl to rest on it, the tiiliiig n t (11) is pinclictl, nnd tlie clip itt ( A ) rclcnsetl. A strciim of water is tlr:irvn ii1t.o tlic iiI)I)ariitrts, riinning rountl iintl ~viisliing tlioroaghly tlic tube (D). \\'lien tlic strigc is rcnclictl l i t which tlic liquid i n t.lic burcttc must be ridclcd i n frnctions of i i drop, tlic .p:irtly-for~iietl drop is tlcpositetl on tlic sidc of (D) by bringing t,hc two togct,licr ii~id \vnslicd into the fltisl; iis I)cforc.

\\'lien oiice tlic coiincsions iire iiintlc t . 1 ~ titriition is easily rind rapidly ciirrictl out.. 'l'lic ritlv:intngcs of the :11>1)ii~iit11~ over n YCSSCI rigidly lisctl to t,lie burette lire obvious, rind it is prcfcriil)lc to tlic Iippiiriitiis proposed by Cole (l'riicticiil L'Iiysiologiciil C'lieniist.ry, Cti~iiI)ridgc, 1'326, 1). 387) in t hiit oiily t i t i

ordinnry filter piinip is rcqiiirt!tl, r i n d it niiiy ciiiploy t l i c c:oii\.enicnt coniciil flnsk. 'l'lic fnct tlirit the vessel tnrty IJC co~nplctcly isolated froni the atinosplicrc nirikcs it. useful wlicrc t3itr:ttions Iirivc to IJC crirricd oiit. in the presence of' giis('s otlicr tliiin ciir.

l'liysical Cllclilistry I ~ i l ~ ~ ~ i i t ~ r ~ , ' 'l'ecliiiiciil College,

u rtdford

TRADE MARKS IN EGYPT 'J'licre has l m n coiisidertiblc troublc in tlic p i s t

over tlic sale of :itlultcrritctl inritcrinls undcr the iiiiiiies of' \vcll-known I)rlinds, rind in tlic rspcctation of stopping this ri Iiiw on trntlc iiinrks iind trade descriptions Iia9 been tlruf'tctl by tlic Uovcriiinciit, anti is iiow Iief'orc the British CliriiiiLcr of Coiniiicrcc of' J5gypt for considcrritioli.

Mm 11 prclirninary tlcscriptioii of wliiit a trade niiirk is, Articlc 2 statcs tlirit protection shiill be

registered i t in the prcscriil~ctl iiiii~incr with the Ih~)~irt t i ici i t of Coiiuncrcc untl liidust ry nut1 the fnct thiit ti pcrsoii is tliily rcgistcrctl iis ilia o\viier will I J ~ co~iuidcrccl p r i m fctcie evidcuce of priority of use, r i d tliercfora of o\viiersIiip. 'I'liosc wlio criii apply for rcgistrntiou of trrirlc iiiarks nru iiitinufnc- turcrs, producers, tlcalertj, ctc. \vliosc Iieiitl oliicc is in Egypt, or wliosi! goods tire producctl tlierc. 'l(1io~e ~iiaiinfiict~~rcm ctc. scttlctl ribroatl i n coiiut rics wliich grnnt rcciprociil riglitti with rcgtird t0 trritlc iiiurkti ciin iilso upply, provided tlirit tlic! trutlc-~nrirk is protccted in tlic country wlicrc the npplicant is scttlcd. Tlic alnusc dcaliiig with t lie iiiitkc-iip of the trridc-iiirirk is conilirelicnsivc iiiirl is sitiiilur in its rcstrictious to tliosu opcrritivc i i i other countries.

enjoyed ody i ~ f t ~ the U W ~ W of il t ~ t l e ~ i i i r k Iiiis

licgistrntion is for 20 years i n tlic first plncc, and witliin ii year of tlic espiry of t,lic first period iipplic- rrtion niiiy be miidc for rcnc\vnl of registration, which iiiriy be repented Iigiiin ;it the ciitl of tlie second period, mtl so 011. If 110 iippliciition is inn& for rcnciviil within tlirce inontlis of the expiry of u pcriotl, tlic Rcgistriir iiiiiy rcniove the triitle niark from tlic register. A triitlc niwk Iniiy lie witMrtiwn from the register on tlic iipplicat~ion of nuy irggric\wl person on tlie groniitl t.liiit tlicrc Iins been no boirn-fde iiscr oftl ie trade iiirirk i n conricsioii 1vit.h siicli goods for five yerirs prccctling tlic ripplication, unlcss such 11011-use ciin be shown to be diic to speciiil circuni- Y ~ ~ I J I C C S jii tlic tr:itlc ~ I J I I I not to miy intention to

tmdc iiiiirk lins Iiccii so rciiiovcd it ciinnot. be rcgis- terctl for the Siinic goods in fiivoilr of :I tliirtl person UII~CSS t hrcc yciirs Iiiivc cliipstd since it \\'its rc~1lio\~ctl froiii t l i c ! register.

iibiilidoli siicli trcitle I l l i i d i 01' llot to US^ it. \\'lien u

\\'licro goods iire I I I ; I ~ C or ~~rodiicctl i n one coontry illid sold in n~iotlicr, the lliil1ic t ~ f t l l c scllcr liiiiy not iipl)ciir on or in conncsioii with t lie goods unless tlic Jlft!ilc of t l~c country of prodnctioii is i i h sho\~11 clenrly. IIoltIcrs of distirict ioiis such ns iiwirdsf ccrtificiitcs, ctc. for goods wlio irisli to iiicntion the fmt iii coiincsioii witli their goods mist state tlie

iiiny not I)c cliiiinctl for goods of one qiiulity which wis in h c t awiirtlctl for goods of iinotlier.

Provision is niiitlc for clc;iling with iufringcnicnts of tlic Act iiud for reinwid of trade marks froni tlic Ibq+ster, if liccessiiry. Provision is to bc iiiadc for provisioniil protection of triidc Illarks of goods coining into &gypt for cs1iil)itions ctc. wliich iirc protected iii tlicir coiiiit.ry of origin, even though

1Sgypt : i d tlic c:oiiiitry of origin.

tlic diitc of the coniiiig into force of the Act sLii11 h i i w tlic right to iipply for rcgistriition of the triidc

exact tliitc n ~ i d Iiiitilre of the iiiviird, i i ~ l t l 1111 ii\\.ard

t.tlCrC lllily be 1 1 0 I'CCi~".OL'id i l ~ ~ i I l l ~ t ! l l l ~ l l ~ IJCt \VCCll

g'hc pl'oIJl'ietOr O f :I t l ' i l( lC Jllllrk i i l r d ~ in llSc iit

11ii~1; witliiri t\vo yciirs of' t l l i i t chtc, i i d t l ~ regis- triitio~i will thte fro111 the tliite of tlic coiiiiiig into force of the Act. PW t\vo yciirs iiftcr tO1e conii~ig illto ~'OIVC of t;hc Act tlic proprietor of ii trtttlc IIliirk will Iiiivc tlic bciiclit, of iiny riglit wliicli lie iiiiiy 1i;ivc liiirl prwionu to the piissing of tlic Act., even though Iic hns niatlc 110 nppliciitioii for rcgistriitioii of 111s triidc Iuiirl;. lhgistriitioii 01 ii1ip triitlc Iliiirli iji tlic uiised Courts previioiis to the dutc of ~ h c Act will Lc consitlcwd primii-Jk:ie cvitlciicc ol' iisc ol' the triitlc iiinrk i n iiny qiicstioii in wliicli priority of iisur is cidlerl in qiiestion, whct.licr for purposcs of rcgist,rr;- tiwi 01- i ~ i legal ~ ~ r o c c ~ i l i ~ ~ g s i ~ i rospcct. of tlrc triidc miirk. 'l'lic iliitliiiig 01' furt Ilcr rcgiiliitions 11s iind wlicn required i n conncsio~i with triidc iiliirlis or t lie iipplicntioii of tlic Act, is Icf~ i i i tlic Iirintls ol' tlic illinistcr of I~i~iiiiicc.

1.Iicrc is no qiicstioii tliiit this l i iwf \dicii it8 collies into forcc with siicli tiiiicriclintwt s iis inny be tipjyovctl or imposed by tlic Cliiiiiilms of Co~~inicrrc, will be of yrcuti vriliic to Egypt. It is one wliicli Iins loug bccii required.

' I

A GAS BURETTE By JOHN HUME

'I'lic nccomp:uiying dingmin sliows a burette for giis nniilysis ; this I)nrctte pcrniits of ncciirate ~ne i~~i i rc~i ien t of both large snniples of gas and the sni:illcr volumes iil)sorbcd by reagents over tlie whole

'J'lic left-liiiiid t,iibc of tlic hurctte is c:ilibratcd so t l i n t its ciipncitics from .+I to tlic l s t , 2114 3rd, nnd .&tli tiiiirlis itre 28, 50, 78, iilitl 100 C.C. respectively. 'J'lic ~ight-lii~nd tul)c is ciilibmtcil from B in ,Ill C.C. frorii o to 26 C.C. 'L'lic bore of tlic riglit-liiind t i i l x is 7--S nini., the siinic :IS tlic I~orc of tlic niirroiv p r t s of tlic left-liiintl tiibc. 'l'lic mercury or wiitcr Icvellilig reservoir is conncctetl Iiy i i lcngtli of ~ I I I ~ I J W tubing to C. In use tllc tlircc-\viiy cock is first turned so tliiit one tiilJc ciin be filled wit11 incrcury or other liquid, tllcn SO tliiit the other in IIC filled, iilid is

~ill lpe, frolll the totti1 \rOIUlllc Of the Snl11l)lC t ( J Zero.

100 - 26

C

tlicn closctl. Coiincsion ifi niride to the vessel con- tiiining thu giis siiniplc, the cocl; is opened to tiilie A , iind 100 c.c. 31s is (Iriiwii in. 'I'lic first, iiI)sorptioii pipette is connected niid the giis forced into it. \\'lien tlic gns is tlrnivn IJiick tiiI,e .+l is filled iiccuriitely with p s to tlic 75 c.c. ni i irk , the rcniiiintlcr lieing drnrvii into tiibc 13 rind tlie roiitriiction noted. 'I'liis procedure is cont inuctl until tlic rciiiiiinilcr of the sriniplc niciisiires less tliiin 78 c.c., \rlicn t i i l x d is tilled only to tlic 50 r x . niiirk, tlw rcniiiiiitlcr IJcing tiiciisilrcd i n tillir 11, i i ~ ~ t l SO 0 1 1 . The h11rettc C~II I I W usctl with i i 1 1 ~ Iii111l of giis iiiiiilysis ill)1)tiriiLiis or tlic siinie principle niiiy bc rrlq)lied i n the design of ti hurettc to snit speciiil iippiiriitmf e.y., i t lins been used with II Sotlciiii type of pipette iiftcr Iinving u tlircc-wiiy cock with niercury ciip joined on t i t D iintl 1)ciiig cii l i brii tctl froni t ltc i t dtlcd S ~ O I I - C O O ~ . 'I'lic i i i i is ini i ini error O I J S ~ ~ V ~ ~ in ii Inrgc iiiriiil~cr of cspcrinicnts \VIM less tliiin 0.1 e.e.

I)cprirt iiietit of iiiorgiinic Clirniistry, 'I'lic Uiiiversity of llcctls