Table of frequency allocations to serve as base for re-
search and experiment on the American Continent

Table of frequency band widths occupied by emis-
sions..

Table of tolerances, frequency.

[App. 1]

234

Table of tolerances for intensity of harmonics of fixed,

TTT, safety signal in radiotelegraph service, definition
and use

SUBJECT

NUMBERS

PAGES

Type B wave, use prohibited in mobile service, excep-
tionally, use permitted on ships for certain services

Unnecessary signals, transmission forbidden
Urgency signal:.

Preceding message "to all stations" (CQ)
Preceding message "to all stations," message of
cancelation when action no longer necessary
Silence to be observed by stations which hear it
To be used only on authority of master, etc
Urgent radiotelegrams

Verification:

Waves emitted by stations, duty of administrations
Visual broadcasting service, definition .

BETWEEN THE UNITED STATES OF AMERICA
(IN BEHALF OF THE CANAL ZONE)

Signed at Guatemala City December 8, 1938.

Ratification advised by the Senate of the United States July 21,
1939.

Ratified by the President of the United States August 11, 1939.
President's instrument of ratification in behalf of the Canal Zone
deposited with the Government of Guatemala September 8,
1939.

Proclaimed by the President of the United States September 18,
1939.