1220 LAWS OF MARYLAND. [Ch. 731]

to produce and deliver such evidence shall be prima facie evi-
dence of the illegal employment of such child in any prosecu-
tion brought therefor.

21. No child under the age of eighteen years shall be em-
ployed, permitted or suffered to work in, about or in connec-
tion with blast furnaces, docks or wharves; or in the outside
erection and repair of electric wires; hi the running or manage-
ment of elevators, lifts or hoisting machines or dynamos; in
oiling or cleaning machinery in motion; in the operation of
emery wheels or any abrasive polishing or buffing wheel articles
of the baser metals or iridium are manufactured; at switch
tending, gate tending, track repairing or as brakemen, firemen,
engineers, motormen or conductors upon railroads, or as railroad
telegraph operators; pilots, firemen or engineers upon boats and
vessels; or in or about establishments where nitroglycerine,
dynamite, duaulin, guncotton, gunpowder or other high or dan-
gerous explosives are manufactured, compounded or stored; or
in the manufacture of white or yellow phosphorus or phosphorus
matches; or in any distillery, brewery or other establishment
where malt or alcoholic liquors are manufactured, packed,
wrapped or bottled; or in any theatre, concert hall, club or other
place, of amusement wherein intoxicating liquors are sold.

22. No minor under twenty-one years of age shall be em-
ployed, permitted or suffered to work in, about or in connection
with any saloon or bar room where intoxicating liquors are sold.

23. No female under eighteen years of age shall be em-
ployed, permitted or suffered to work in any capacity where
such employment compels her to remain standing constantly.

24. In cities having a population of 20,000 or over no per-
son under the age of eighteen years shall be employed, per-
mitted or suffered to work as a messenger for telegraph, tele-
phone or messenger companies in the distribution, transmission
or delivery of goods or messages before six o'clock in the morn-
ing or after ten o'clock in the evening of any day.

25. Every employer shall post and keep posted in a conspic-
uous place in every establishment wherein any person under the
age of eighteen is employed, permitted or suffered to work, a
printed copy of the sections of this act relating to hours of labor.
Such copies shall be prepared by the Maryland Bureau of Sta-
tistics and Information and be furnished by it on application
of such employer.

26. No boy under 12 years of age and no girl under 16
years of age shall in any city having a population of 20,000 or
over distribute, sell, expose or offer for sale newspapers, maga-