2.--_Chemical Analysis._

(_a_).--Record of moisture, nitro-glycerine, sodium or potassium

nitrate, and other chemical constituents, as set forth by the

analysis; percentage of ash, hygroscopic coefficient--the amount of

water taken up in 24 hours in a saturated atmosphere, at 15° cent.,

by 5 grammes, as compared with the weight of the explosive.

(_b_).--Analysis of products of combustion from 100 grammes, including

gaseous products, solids, and water.

(_c_).--Composition of gaseous products of combustion, including

carbon monoxide and carbon dioxide, hydrogen, nitrogen, etc.

(_d_).--Composition of solid products of combustion, subdivided into

soluble and insoluble.

_3.--A Typical Analysis of Natural Gas._

Used in tests, as follows:

Carbon dioxide 0.0 per cent.

Heavy hydrocarbons 0.2 ” ”

Oxygen 0.1 ” ”

Carbon monoxide 0.0 ” ”

Methane 82.4 ” ”

Ethane 15.3 ” ”

Nitrogen 2.0 ” ”

-----

100.00 per cent.

_4.--Typical Analysis of Bituminous Coal Dust, 100-Mesh Fine, Used in

Tests._

Moisture 1.90

Volatile matter 35.05

Fixed carbon 58.92

Ash 4.13

------

100.00

Sulphur 1.04

_5.--An Average Analysis of Detonators._

Used on Trauzl lead blocks, pressure gauge, calorimeter, and small lead

blocks:

Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 · 第 13 / 46 题