h | in | in |
they took in melting. |Grains.|Seconds|
--------------------------------------+-------+-------+
Pure gold | 20 | 4 |
---- silver | 20 | 3 |
---- copper | 33 | 20 |
---- platina | 10 | 3 |
Nickel | 16 | 3 |
A cube of bar-iron | 10 | 12 |
--------- cast-iron | 10 | 3 |
--------- steel | 10 | 12 |
Scoria of wrought-iron | 12 | 2 |
Kearsh | 10 | 3 |
Cauk, or terra ponderosa | 10 | 7 |
A topaz, or chrysolite | 3 | 45 |
An oriental emerald | 2 | 25 |
Crystal pebble | 7 | 6 |
White agate | 10 | 30 |
Oriental flint | 10 | 30 |
Rough cornelian | 10 | 75 |
Jasper | 10 | 25 |
Onyx | 10 | 20 |
Garnet | 10 | 17 |
White rhomboidal spar | 10 | 60 |
Zeolites | 10 | 23 |
Rotten-stone | 10 | 80 |
Common slate | 10 | 2 |
Asbestos | 10 | 10 |
Common lime-stone | 10 | 55 |
Pumice-stone | 10 | 24 |
Lava | 10 | 7 |
Volcanic clay | 10 | 60 |
Cornish moor-stone | 10 | 60 |
--------------------------------------+-------+-------+

_Fulminating Powder._

This powder is made by rubbing together, in a hot marble mortar, with
a wooden pestle, three parts, by weight, of nitre, two of mild
vegetable alkali, and one of flowers of sulphur, till the whole is
accurately mixed. If a drachm of this powder be exposed to a gentle
heat, in an iron ladle, till it melts, it will explode with a noise as
loud as the report of a cannon.

_A more powerful fulminating Powder._

The most wonderful instance of chemical detonation is formed by the
combi