WM. PRESTON LANE, JR., GOVERNOR. 1077

7. Copper tubing shall be coiled and uncoiled properly.
The part of the tubing that is affected by frequent coiling
and uncoiling shall be renewed periodically because of the
dangers from kinks and crystallization.

8. Blow-down valves shall not be less than 45 feet from
the lace and shall be around a right angle.

9. Holes for Airdox tubes shall not be on the solid.

10. The Airdox tube shall be pushed to the back of the
drill hole and then withdrawn 6 to 12 inches to form an
air cushion.

11. When blow-down valves are opened to discharge the
Airdox tube, they shall remain open until time to place the
tube in the next borehole.

12. After the breaking down of the coal in any one
place, the tube shall be disconnected at once from the air
line and not reconnected until ready to be used in the next
place.

13. When an Airdox tube fails to discharge, the line
leading to the tube shall be disconnected at the blow-down
valve and the tube shall be dragged by means of the line
to an abandoned place, marked with warning signs, and
left for 12 hours before any repair work is done thereon.

14. All persons shall be removed from adjoining work-
ing places where there is danger of breaking through and
shall be at a safe distance around a right angle, while coal
breaking is in progress.

SEC. 3. And be it further enacted, That Sections 46,
81, 86, 123, 124 and 129 of Article 89 of the Anno-
tated Code of Maryland (1939 Edition), title "Department
of Labor and Industry, " sub-title "Bureau of Mines, " be
and they are hereby repealed.

SECTION 4. And be it further enacted, That this Act shall
take effect June 1, 1949.

Approved April 29, 1949.

CHAPTER 438
(Senate Bill 178)

AN ACT to add a new section to Article 81 of the Anno-
tated Code of Maryland (1947 Supplement), title "Rev-
enue and Taxes", said new section to be known as