194 UHLLG-THE ELLlO!tT GAS ANALYSlS APPARATUS [Fcb. 28, 1010.

uniformly hot so that it will not crnck. Tlicso flasks crack whon tho lcnst blast of air striltcs thom, owing t o tho high boiling oints of tho oils, but thoy taro raroly brokon whon using ti% iron covcr mndo of two doop snnd baths.

--- APPARATUS FOR DETER,JIINING SULPHUR IN

SPENT OXIDE.

BY Dlt. A. 11. ELLIOIT.

Tho appnrntus is n niodificntion of tlint used b Dr. E. Grnefc for dctcnnininp tlic volntilc sulpl~ur in eon1 It consists of R Inrgo bottlc holding nbout 8 litrcs, fitted with a rubber stopper licld in plneo by n 1lnt brass spring

Fig. 4.

slippcd on sidcwngs. Throngli tho stopper is n liolc tc cnrry n 100 C.C. scpnrnting funnel nnd two pcrforntioni for coppcr wires. Ono of tlicsc wires is diort, rcnching nbout ono-third down tlio height of tho bottlo; tho othc cnrrics a brnss dctlngrntioii cup, ns nscd in csporiincnt. wit11 pliospl~orus in osygcn. At a point drcro tlio shorl wiro conies nenr tho longcr one i t is covered with plntinun foil nnd tho ndjnccnt dellngrtrtion wiro is nlso covered Between tlicsc plntini~ni tcrminnls n connection is nindc with very fino iron wire, cnpnblc of being nielted by tL current froiii six dry cells.

Into tlic dcllngrntion cup piit a very littlc dry cottoi wool, tlien connect tho cotton by strnnds of cotton wicltinl wit11 tlic iron nt tlio tcrniinnls. Using 1 grnt of dry spen osidc inis i t with 1 p i . of n niistitrc of cl~lorntc nni nitrnto of potirssiunl ( 3 to 1) nnd plncc upon the cottoti 'l'? stnrt tlic nppnrntus tlic liottoiii of tho bottlc is cowre wit11 n littlo distilled cvntcr, niid tho I~ottlc thrn filled wit o+ygcn by clis~~lncc~~icr~t. Tho dcflngrntion spoon i i n ~ wrcs nro inserted into tlic bottlc, tlic spring ndjustcd nw tlio clinrgc fired by ~ncniis of tlic Iinttcry. TI10 nction i ininiedinto nnd tlic bottlo nlnst 1Jc cooled to condens vnpours. Tlic scpnrnting funnel contnins 50 C.C. of 10 pe cent. solution of sodiuni ~icrosido which is nllowcd to ru, into the bottlo wlicn it cools. 1'110 IJottlo is wnslicd ou and llic solution nindo to 300 C.C. 'l'o 10 C.C. of this nr ndded mctliyl ornngo nnd 5 C.C. of dilutc 11ydroclilori ncid, und tho roluriie iiiudo up to 100 C.C. Olio g r i . c bnrinrn chlorido crystnh is lidded, tho wholc nllowtd t btnnd 16-30 minutes niid tho turbidity dctcrmincd. , tnblo of bnrinin sulplinto turbiditics is used for tho dctci ininntion. Or tlio solittion limy ~ J C filtcrcd, tho bnriui sulplinto wnslied, dried, niid wciglied ns usunl.

PORTABLE BAR PlIOTO~lETER. USED ny Dn. x. 0. LOVE, CIIIEB OAS E S A ~ E R ,

CITY OB S E W YORX. 1 7 lhis * photomotcr consists of a woodcn frn~no-wor

supporting a plntforni on which is placed tho bnr nnd Big

OS, tho cnndlc bn~nnce, gns p i k , gorcrnor, nnd special iiinll wet mctcr. Tllc wholo is enclosed with opnquo lnck curtnins (not slio\r?l in tho figure). I n tliesc curtains. icrc nro openings a t tlic top over tho gns pillnr nnd tho tnnd?rd light. mlo opcrntion of tho photonictcr does ot differ from that of any ordinnry open bnr pliotonictcr onstructed for a dnrk room.

Fig. 6.

JIn C. 11. STOSE, Gns Engineer for the Publio Service ?ommission nt t\Ibnny csliibited nn cscellcnt portnblo ihotomctcr nnd crplnined its uscs. It is very coinpact vhcn closed nnd sl~utcl up into tlio spncc of n lnrgo dress uit enso ; yet whcn unpnckcd nnd fiet up in fire minutes is a regulnr working photoinctcr.

Ho nlso gnvo his cspcriencc~ with tho Jenkins siilphw ~ n r l ninnionin nppnrnt~s ; testifying to its usefulncsa and iccumcy in tlic enso of sulphiir nnd nniinoriin tests. This nppnrntus \YNI described in tho Journnl of' Aincricnn clicniica~ Socicty, April 1~00, and 11m been iinprovcd by Ik. Stono to include uniinonin test siniultnnc. ously with tho sulpliur test.

Ill' E. C. UIIWQ.

Coin inrntivo results obtained with tlic Elliott an& ~eiiip21 gns-nnnlysie npprntue in m y Inborntory gar0 tho following results :-

cu. ft. lioldcr ; tho tviitcr in this lioldcr hnd been xtiindinji tlicro. for nbout two ycnrs, tho cvnporntioii bcing rcplnced from tinic to tinic, so thnt tlic wntcr wns ns snturnted with gns. 11s wus possiLdc. Srtniplcs of tlic gas wcrc talien from tliis. lioltlcr for both nppurntus. Tlicso snniplcii acre IiiinIyECd with tllc following results :-

r\ Ooliinio of gns (3 cii. ft.) ~ u s tnkckl into a

Elliott ' IIempel Per cmt . Per ccat. - ~~

ciwholl iiiositle. ................... 3.6 Illuniii~nnts ....................... 13.6 (Jsygcn .......................... 04 Carbon ~noiiosldo ................. 2i.U ...... Ilydrogen ........................ zwv'3 Jlethnlm .......................... 1u.s Ntrugcti ......................... 0.4

.. .. .. .. .. .. ..

.

Tho nliovo inctlinno and nitrogen rcsnlts wero cnloulatctl froni 1110 csplosion, using 1110 rcgulnr contrnction factors.. CnlcuIating tho suiiio from tliu rcsidunl ~iitrogcn left nfter csplosion niid nbsorption of cnrbon dioside nnd oxygen. witli sodium iiyro~nllol, tlic followiirg lignrce were _ - - obtninccl :-

Elliott IIcnipcl Per cent. Per ccnt.

Jretllano ......................... lO*l! . 11.G Ntrugcn ........... .............. 0.s .. U' I

Froin tliu rcsidniil gns of tho I.icinpcl snniplo 20.2 c.c.. of tho gns wero tnkcn niid iiiised with 4 7 4 U.C. of nir nndt