β Scribed by Silberrad, C. A.
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In tho usual type of Scliifl's nitroiUetcr tlic measuring tubc ip of uniform borc nnd is graduntcd froin O to 100 C.C. in 1/5tli of a C.C. Tlic graduntioiis a t tlic lowcr end .of tlic scale arc practically useless, as in ordcr to frtc tlic nitrogen from tlic carbon dioxide used to drive it over, i t sliould pass through a considerablc lcligtli of cnustic potash solution.
'l'liis form of nitromotcr also tjul~crs from tlic tlcfcct tlint, hi ordcr to kccp tlw Iieight of the instrument witliin rccisoiinblc h i t s , i t ]ins to bo iimtlc of wicioborc tubing. Coiiscquciitly it cnnnot be grnduntetl to rcad to less tlinti 1/5 c.c., wliidi is not sufiicicotly ciocurntc, prticulnrly if tlic sabstnivm which is bcing miulysetl oidy rontniiie n low pcrccntago of Iiitrogcii.
111 the iippm~~tus illustrntcd* tlicrjo liltlo diflicultics m e ovorco~c. By cnliuping tliu dicimctcr of tlw lowcr portioti of tho tube tho cnpncity of tltc np~)nriitus linb Leeti n~eule to corrospond to tlint of an ortlinnry * l'liis apparatus wns mndo for tho nuLlior by lioyiiolds nntl Iji~iui~on, Ltil., Lootla.
Schiff's nitromctcr. The mcnsurnlg portiou of the tubc is rcduccd in diameter to approsimetely the size of nn averagc 5Oc.c. burcttc and graduated in l / l O t l i of a C.C. and by aid of a lens can bc easily. read
In n lnrgc ~mxnbcr of the substances annlyscd by thc author tlic contcnt of nitrogcn -nricd from about 6-20 per cent., i.c., tllc voliilnc of nitrogcn obtniiicd from 0.1 g. of substnncc woukl v n ~y roughly from 5 C.C. t o 20 C.C. and M) thc best quantity for a nitrogcn cstimntion is from 0.1 g. to 0.2 g,, i t is casy to mlXlngC matters so tliat thc rcsultnnt volume of nitrogen shall vary from 10 C.C. to 20 C.C. 'J!hcrcforo in ordcr to Irccp tlic instrument compact the mcasuring portion of the tube is only gradanted from 0 to 25 C.C. to 1/20 C.C.
π SIMILAR VOLUMES
## Abstract A new synthesis of [^18^O]thionyl chloride has been developed which, for the first time, allows the product to be isolated in pure form.
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