1050 LAWS OF MARYLAND. [CH. 437

months. A written record shall be kept of inspections and
tests, which shall be open for inspection by interested
persons.

(f) The speed of the cage when hoisting or lowering
men, shall not exceed 900 feet a minute.

(g) There shall be at least two independent methods of
signalling, one of which shall be audible to the engineer,
from all landings in shafts and slopes.

(h) Workmen shall wear safety belts while doing re-
pair work in or over shafts.

(i) When men are being hoisted or lowered at the be-
ginning and end of each operating shift and when men
are working in the shaft, an attendant shall be on duty at
each cage station where men are being handled. Shafts
shall be equipped with self-closing or manually controlled
safety gates at surface landings.

(j) Positive stop blocks or derails shall be placed near
shaft surface landings.

, (k) At the bottom of each hoisting shaft and at inter-
mediate landings, a "run-around" shall be provided for
safe passage from one side of the shaft to the other. This
passageway shall not be less than 5 feet in height and 3
feet in width.

90. Haulage-roads. The roadbed, rails, joints, switches,
frogs, and other elements of the track of all haulage roads
shall be constructed, installed, and maintained in a man-
ner consistent with speed and type of haulage operations
being conducted to insure safe operation. Track switches,
except room and entry development switches, shall be pro-
vided with properly installed throws, bridle bars, and
guardrails; switch throws and stands, where possible, shall
be placed on the clearance side.

91. Clearance and Shelter Hoists, (a) Haulage roads
by motor on entries developed after the effective date of
this Act shall have a continuous unobstructed clearance of
at least thirty inches from the farthest projection of mov-
ing equipment on the side opposite the trolley-wire and on
animal haulage roads the clearance shall be at least twenty-
four inches.

(b) On the trolley-wire or "tight" side, there shall be
sufficient clearance to prevent the farthest projection of
moving equipment from rubbing or coming in contact with
ribs or timber.