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1873 - Old Forge Coal Mines

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INSPECTORS OF MINES. 245<br />

What is the width of<br />

pillars<br />

Width of the chain- ^<br />

bers, feet N<br />

|<br />

How wide are the air- I<br />

^*-'<br />

ways, feet<br />

|<br />

How wide are the headings,<br />

feet ^<br />

|<br />

Angle of slopes in the I<br />

mines, degrees<br />

|<br />

CO CO X CO 50<br />

io liio "3 o >a is is is<br />

©©©>©© ooo<br />

*<br />

CN C^I<br />

m cn<br />

Length of slopes in the<br />

mines<br />

Angle of planes in the<br />

mines, degrees<br />

X 00 O.iS t— © © X<br />

iS Cl X X O".<br />

X IS<br />

Length of planes in the<br />

mines<br />

© o © © -* o<br />

;oo«5ffl«3<br />

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