51' l~e 3~@wb~re qf SJphuric Aoid.
:~l~ ON IHL MANb]'ACILRL OF SbL[ Itl;RIC ACID. H. Pembcrton, ,Jr., ,'ires in the JOURNAL ()F Tt[E I; RANKLIN IN- s'rrrr'r}:, 1883, vol. 115, p. 356, some results from the manuihcture of sulphurlc acid t?om brhnsto,le, which illustrate the ratio between the nitre consumed and (he (,hambcr (.al)acity ; they are of interest, as they include a (.haraber system working with Gay-lmssac towers.
I'e)nberLon c'd('ulates from the amount of the denitratcd Gay-Lussac acid the quantity of nit)'(, that ))assed through the chambers to every 1()() parts brimston% and tin(Is 15"6 per cent. nitre, including ~ 'o per (,era. ](>t.
H~trter (1882, ecxlvi, :~11 ) tbmn[ in his theoretiea| examination of the sulphuric acid l)rO(~Css, tha~ the pr(,duct of the chamber space and nitre eonsumc(t~ apl,ro:wh(> '~ (.(ms(a))l tig'ure, whic.h rcpre~('nts the chamber eap~c'ity corresponding t(, on(, p(')' cent. nitre consumcd, Gay-Lu.'~c lowers not I)ei~g used. Tim chambcr capacity and nitrogen compounds present are indirectly pr()l)ortiona| to each other, provided that the loss oi "~ su]phu)" is e(lU:dly g'reat, and the acid 1)roduccd is of uni-fi~rnt con (-(,ntration. \Vh(m working with weak acid, a smaller cham-