ounce, was ground by tee governor of the 
\ gk extracted from it a drachm of gold. 
'** native iron has been found at Eibenstock 
'^^'Sheri ’ and also in Siberia, where one particular mas* 
'^Hp^r.lQOO pounds. It resembled forged iron in its 
and was malleable when cold, but brittle 
'tcnf • 1° Senegal, where it is most common, it is 
®arm, and is employed by the natives in the 
Ifojj of different kinds of vessels, 
a y ’ ^'dtough one of the imperfect metals, is susceptible 
'''atai f polish, and more capable than any other 
. leaving its hardness increased or diminished by 
'’eg g ^nernical processes. It is often manufactured in 
as to be one hundred and^fifty times, and, as will 
even above six hundred and thirty times, more 
^^n gold. On weighing several common watch- 
b 
ikon mine. 
2JT5 
springs, such as are sold, for ordinary work, by the 
'll; 
®«>sts, at half a crown, ten of them were found 
one single grain. Hence one pound avoir- 
X- 
3 to seven thousand grains, contains ten times 
ea I these springs, which amount, at half a 
to 8750 pounds sterling. ■ Reckoning the troy 
ijh^'00 pounds sterling, and the pound, equal 
at 48 pounds sterling, the value of an aver- 
Pound of gold is 58.33, or 58l. 6s. yd. 
value of the watch 
Tlie above 
springs weighing an 
of ^ P°ond, being divided by that sum, will give 
more than 150 to 1 . But the pendu- 
4 of the best kind of watches sell at iialf a 
i^lj.'ktug o and at this price the abovementioned value 
iL'"!' O' toe ratio of four and one fifth to one j 
W '^'vid^j amount of 36,750l. sterling. This sum 
r. Sivfi value of the avoirdupois pound 01 
the* ^,'lO'Ot’cnt of more than 6’30 to J . 
property of iron, after it is reduced 
Itot ^ steel, that, although it is sufficiently soft 
*itu' gradually cooled, to be formed witliout 
''urious tools and utensils, still it may be 
hy ^‘^uted more or less bard, even to an exti'eme 
■ ■J’j^.^'toply plunging it, when red hot, into coM 
^ called tempering, the hardness produced 
*■ to proportion as the steel is hotter, and tlie 
