Discussion on the effect of the European war on the chemical industry of Great Britain

• Publisher: Wiley (John Wiley & Sons)
• Year: 1915
• Weight: 451 KB
• Volume: 34
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000340705

✦ Synopsis

327

top and bottom stones were rlressed cxnctly d i k e as they laic1 sidc by side: when t h e top stona wn.q turned over the furrows would be in opposite dircctions, so thnt mhcn i t w n ~ twisted round there mns n scissor-like action between tho stones.

The " lnnd " was the ground beta-ccn the furrows. The mill wit: tho interininnblc stnircnsc wns a ' h u p p mill.

Sharps " waq n misturc of flour niid fine brnn thrown out bccnuse it could not be sepnrntcd. About 10% of very fine sharps wns producctl in milling. Aniline coloiirs mere usually ground in ball mills if tlicrc were siilllcicnt C O ~O U F to justify i t : in cnsc of one or two cmt. only, i t . was ground in an ed e-runner mill. IIc suggested to Jrr. Smitii tliat roc% emery or composition stones might be iisccl instead of continentnl qunrtz or E n lish mill stones, and grinding dry, or wet linll mi&. plat stones were often usci1 for grinding brlsic slnC. I n reply to Dr. Cnvcn, thcre wns no enuse to hent lcnd or nlumininm in any way. He Iincl ground compo pipe, lcnd foil, nnrl so on without nny trcntnicnt. The nliciniiiiiini ingots \vcrc roughly broken up into ounce or hiill-ounce pieces nnd could 4: gmiincl into particles of 1/20,000 sq. inch. llic tcrii1)crntiiro in the mill wis never high, thougli i t lniglit rise locnlly to 40" C.

DISCUSSION ox T ~I E Emmr

The CIIAIRX~AN, having rcfei~ed to the Government schcmc for thc mnnufncture of dyestuffs, nnd enumerated some of tile objections to the srhcrnc,