TRANSACTIONS OF THE SECTIONS, 53 
SpanisH Harp Leaps. 
Original Lead. First Calcination. Second Calcination. 
95°81 64:98 56° 
NG GA iveyehoieieydiotae rane 
Antimony 61.) <dseone OO 29°84 43°40 
Copper ...ssseeeeee 0:32 5:90 traces 
ition Heponnc Po sn 0:20 traces 
100-00 100:92 100-00 
The author has found that the addition of a small quantity of soda ash to the 
dross, in the process of reduction, acts very beneficially ; and as it enables the work- 
man to work at a lower heat, a quantity of antimony is saved. This action is 
illustrated by the following analyses :— 
Without Soda Ash, With 2} per cent, Soda Ash. 
2: 58°70 
ILench ygorenodn arooond 82:88 
Antimony .........05. 16:09 40°66 
CigiG Se iceoooneoonon 0:68 0:32 
TROWI sss diet y's.« oeislave e's sisie : 0°35 0:32 
100:00 100-00 
The alloy of antimony and lead obtained in this process answers very well in 
the preparation of type furniture. 
In these operations a quantity of refuse products accumulate in the smelting 
works, which are reduced in small blast furnaces; and after some time the hearth 
of these fumaces is gradually filled with a spongy semifused mass, called a Cuesco 
by the Spaniards. One of these masses was analyzed, and found to contain 
edie catalase PAomiee ea yciciot isic 61:35 
AMtIMONY «0020 e uence a Diepretetens 29°50 
COpper’ so oes sive. siajeiene spasfelstelehepale 8°30 
1LXoh ea aOR IRIS Ta Lrccoe ceo ch GOT 061 
fhe 7 MReMeenneticoon dont once: .. traces 
99:76 
On the Use of Fuel in Marine Boilers. 
By Tuomas Ricuarpson, M.A., Ph.D., F.RS.L., §c., and T. W. Bunning. 
The object of these experiments was to examine the effects produced by mixing 
coals of different characters. 
As regards the use of fuel in raising steam, coals may be divided into non-bitu- 
minous, semibituminous, and bituminous. The two latter cannot be burnt with 
close fire-doors without the formation of smoke, while the former require a peculiar 
stoking to obtain a maximum evaporative effect. 
In conducting the experiments at Her Majesty’s Dockyard at Keyham, the 
character of the smoke was recorded according to the following scale :— 
Infos Inn eontorinaa pep oc but Very light. 
Ds aie wpeuavoeeke cabal ejaleeyapels Light. 
Soren osuenncapooedan Light brown. 
is ie diitonte.e Cae Sek oe . Brown. 
ES Ainseyco pod cce anata c Black. 
(i abe Bh acetone ine eey C Very black. 
The experiments lasted six hours on an ayerage, so that the greatest number of 
marks which could have been recorded against any coal was 2160. 
When Hartley coal was burnt with close doors, the number recorded was 292, and 
against Welsh coal (Gellie Cadoxtan) the number was 40. 
When these coals were mixed in equal quantities and burnt in the usual manner 
with close doors, the number recorded was only 1. 
The details of these experiments were given in Tables, and the extraordinary fact 
is thus found, that a mixture of these two coals can be burnt in an ordinary steam~- 
boiler furnace, with the usual stoking, without producing the smallest smoke. 
Another series of experiments has heen made, which conlirm the above obser~ 
