1040 LAWS OF MARYLAND. [CH. 437

elusive, and 144-149C, inclusive, of said Article, amend-
ing and revising the Mining Laws generally.

SECTION 1. Be it enacted ~bytlie General Assembly of Maryland,
That Sections 16, 34, 62, 64(a), 73, 89, 130, 131 and 133 of
Article 89 of the Annotated Code of Maryland (1939 Edi-
tion), title "Department of Labor and Industry, " sub-
title "Bureau of Mines, " be and they are hereby repealed
and re-enacted, with amendments, to read as follows:

Bureau of Mines.

16. For the purposes of this sub-title, the terms and
definitions contained herein shall be held, construed and
understood as follows:

(a) "Approved. " Unless the context requires a differ-
ent sense, the word "Approved" means and refers to ap-
probation evidenced by a written certificate or official
letter of the Bureau, approving a device, plan, formula,
method, machine or course of action.

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

(b) "Communication device" means any device em-
ployed 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. "

(c) "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.

(d) "Electric Circuit" means all conductors, including
ground returns, furnishing energy to or receiving energy
from electric apparatus.

"Electric System" means all apparatus and circuits re-
ceiving 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 so
considered as a part of the electric system. If power is