1072 LAWS OF MARYLAND. [CH. 437

(g) Only nonmetallic tools shall be used for opening
containers. Extraneous materials shall not be stored in
an explosives or detonator magazine.

(h) Smoking, carrying smokers' articles, or open flame
shall be prohibited in or near any magazine.

145. A Cardox charging station shall:

1. Be in a fireproof structure on the surface or isolated
from other operations in the same building by a substantial
fireproof partition.

2. Be provided with at least two methods of relieving
excess pressure in the storage tank. If one of these meth-
ods is a valve, the valve shall be tested monthly.

3. Have a box-type magazine or equivalent for storing
the daily supply of heater elements.

146. Underground Transportation, (a) Permissible
explosives or detonators carried underground shall be in
individual containers constructed of substantial noncon-
ductive material, maintained in good condition and kept
closed.

(b) When explosives or detonators are transported
underground by locomotive, rope or shuttle car, they shall
be in special covered cars or in special containers.

1. The bodies and covers of special cars and containers
shall be constructed of nonconductive material.

2. If explosives and detonators are hauled in the same
explosives car or in the same special container, they shall
be separated by at least a 4-inch substantially fastened
hardwood partition or the equivalent.

3. Permissible explosive, detonators and cardox shells
shall not be carried on the same trip with workmen.

4. Where quantities of explosives and detonators are
transported in special cars or in special containers in cars
they shall be hauled on a special trip, not connected to any
other trip, and shall not be hauled into or out of a mine
within five minutes preceding or following a man-trip or
any other trip.

(c) Explosives and detonators shall be transported
underground by belt only under the following conditions:

1. In the original and unopened case, in special closed
cases constructed of nonconductive material, or in suitable
individual containers.