ART. 12.] MANUFACTURERS AND MINERS. 1269

their own expense all props and all the requisite timber that may
be used in the working of said mines; and as the miners

employed at work therein proceed with the working of their

excavations, it shall be the duty of the owner, lessee or agent of
said mines to furnish a sufficient quantity of timber at the place

where the miners are at work; and whenever the said workmen

engaged in the said excavation shall deem it safe and proper to
have any of the props or timbers removed from said excavations,
it shall be the duty of the person so employed by the owner,
lessee or agent, to remove the said props and timbers to whatever
point or place the workmen engaged therein may require, but no
props or timber whatever shall be removed when such removal
may endanger the lives of any of the workmen engaged therein.

1878, ch. 157.

159. Whenever any impure air or gases are known to exist in
any of the mines in the said counties of Garrett and Allegany,
which are likely to endanger the lives of the miners employed
therein, it shall be the duty of the mine inspector, upon the same
being made known to him, to proceed at once to make a careful
examination of the ventilating apparatus of the said mine, and if
he shall find that the gases and impure air existing in said mine
are because of the bad condition of the ventilating apparatus
connected therewith, he shall immediately notify the owner, lessee
or agent, to expel from the said mine all noxious gases and impure
Air existing therein, and to properly ventilate the same.

Ibid.

160. The mine inspector shall also be inspector of weights at

all the mines now or hereafter operated in said Garrett and Alle-
gany counties, and shall have power to weigh the coal mined
therein, from time to time, on the scales at the different mines in
said counties, and to test the accuracy of such scales, and to do
any other act that he may deem necessary to ascertain whether or
not the miners are allowed full weight of coal in the mining cars,

when placed upon the scales of the different mines; and it shall
be the duty of every person acting as weighmaster for the owner,
lessee or agent of any of said mines, before entering upon the
performance of his duties as said weighmaster, or before making