HARRY W. NICE, GOVERNOR. 333

mines employing less than ten persons from the provisions
of this sub-title and placing Fire Clay Mines under the pro-
visions of this Act.

SECTION 1. Be it enacted by the General Assembly of Mary-
land, That Section 17 of Article 89 of the Annotated Code of
Maryland (1924 Edition), title "Statistics and Information",
sub-title "Bureau of Mines", be and it is hereby repealed and
re-enacted with amendments to read as follows:

17. Por the purposes of this sub-title, the terms and defini-
tions contained herein shall be held, construed and understood
as follows:

Approved: Unless the context requires a different sense, the
word "approved" means and refers to approbation evidenced
by a written certificate or official letter of the Bureau, approv-
ing a device, plan, formula, method, machine or course of
action.

Approved Equipment means equipment admitted by the
Bureau to its approved lists under Bureau regulations after
tests satisfying such Bureau that such equipment is safe and
is adapted to its intended use.

Authorized person means any person commissioned by an
official in charge in or at a mine to perform certain prescribed
duties under his authority.

Communication Device means any device employed to
transmit intelligence, instructions or warning to persons not
present.

Crosscut means a passage driven to connect adjacent
parallel entries or rooms. The term is synonymous with "cut-
through" and between rooms, when driven wide is synonymous;
with "break-through".

Drift means a horizontal passage-way, or level, or gangway,
driven from the surface outcrop into the coal bed.

Duty as applied to a machine or device, means the particular-
service in which such machine or device is being employed or
intended to be employed.

Electric Circuit means all conductors, including ground re-
turns, furnishing energy to or receiving energy from electric
apparatus.

Electric System means all apparatus and circuits receiving
electric energy or that may receive electric energy from a
common source. Where the source of power is under control
of the mine, such source of power will be considered as a part
of the electric system. If power is obtained from a central
station not under control of such mine, the phrase shall refer
only to that part of the system which is under control of such
mine.