AERONAUTICS 177

landing field which has not been rated as safe for the purpose for which
it is to be used, by the State Aviation Commission or the United States
Secretary of Commerce. This sub-title shall not be construed to prevent
the emergency or intermittent use of any field for aviation purposes when
an authorized landing field is not available.

An. Code, 1924, sec 35. 1929, ch. 219, sec. 22.

43. The State Aviation Commission is authorized and directed to
promulgate such plans, ratings and regulations as soon as possible after
June 1, 1929, and from time to time thereafter to prepare and issue
bulletins giving the location, rating and a short description of all approved
airports and landing fields within the State of Maryland.

An. Code, 1924, sec 36 1929, ch 219, sec. 23.

44. Pending promulgation of all rules and regulations for airports and
landing fields by the State Aviation Commission, it shall be unlawful to
operate aircraft regularly for the purpose of carrying passengers for hire
from any airport or landing field, which has not been rated D5x or better
by the Department of Commerce, provided, however, if a field does not
hold a rating of D5x or better and has not been refused such a rating, it
shall be lawful to carry passengers temporarily out of such a field upon
proof that an application has already been made to the Department of
Commerce or to the State Aviation Commission, for a rating.

Marking of Cities and Towns.

An Code, 1924, sec 38. 1931, ch. 401.

45. Every incorporated city or town of this State having a population
of four thousand or more, according to the 1930 Federal Census, shall on
or before August 1, 1931, establish on a conspicuous place, approved by
the State Aviation Commission, and thereafter maintain a sign in letters
not less than four (4) feet in length, in chrome yellow, on a black back-
ground and facing the sky, which sign shall contain the first and last letter
of the name of the city or town so marked, followed by a dash and the
letters "MD. " This same sign shall be continuously flooded at night by
an electric light of not less than five hundred (500) candlepower. Towns
and cities so desiring may, in place of the abbreviated name, use the full
name, followed by a dash and the letters "MD. " Any city or town failing
to comply with any of the above provisions for a period of thirty days
after receipt of notice from the State Aviation Commission, directed to the
Chief Executive Officer and/or the governing body of said city or town,
calling attention to said omission or omissions, shall forfeit and pay to the
State Aviation Commission the following respective sum or sums, to be re-
covered by the said Commission in a civil action, such sum or sums to be
applied by said Commission to remedying the said omission or omissions
on the part of such delinquent municipality, such sum as will be the ap-
proximate cost of the installation.

Air-Carriers' Liability and Recording of Sales and Mortgages.

An Code, 1924, sec. 39. 1931, ch. 403, see. 38.

46. If any shipper of platina, gold, gold dust, silver, bullion, or other
precious metals, coins, jewelry, bills of any bank or public body, diamonds,