l'lii>t<)gr;ii)hc(l liy (iodfrey BinpU-y, llfa<lii)i:lfy, Lecd.-. 
Fig. 1. 
MOl TH OF Af.U.M POT. 
Photogiai)lif!l by S. W. Cuttriss, I^-eds. 
Fig. 
brid(;e in alum I'ot. 
Proc. York-.s. (UoL and Polyfec. Soc, Vol. XV., Plate XXXIV. 
