An Act to authorize the use of the incompleted submarine Ulua as a target for explosive tests, and for other purposes
PL 82-173 (S.1994), enacted 10/12/1951

4 2 0 
PUBLIC LAW 173—OCT. 12, 1961 
[65 STAT. 
lights or signals, or of any neglect to keep a proper look-out, or of the 
neglect of any precaution which may be required by the ordinary 
practice of seamen, or by the special circumstances of the case. 
RULE 30 
Reservation of Rules for Harbours and Inland Navigation 
Nothing in these Rules shall interfere with the operation of a special 
rule duly made by local authority relative to the navigation of any 
harbour, river, lake, or inland water, including a reserved seaplane 
area. 
RULE 31 
Distress Signals 
When a vessel or seaplane on the water is in distress and requires 
assistance from other vessels or from the shore, the following shall be 
the signals to be used or displayed by her, either together or separately, 
namely:— 
(a) A gun or other explosive signal fired at intervals of about a 
minute. 
• (b) A continuous sounding with any fog-signal apparatus. 
(c) Rockets or shells, throwing red stars fired one at a time at short 
intervals. 
(d) A signal made by radiotelegraphy or by any other signalling 
method consisting of the group . . . 
. . . in the Morse Code. 
(e) A signal sent by radiotelephony consisting of the spoken word 
"Mayday." 
(f) The International Code Signal of distress indicated by N.C. 
(g) A signal consisting of a square flag having above or below it a 
ball or anything resembling a ball. 
(h) Flames on the vessel (as from a burning tar barrel, oil barrel, 
&c.). 
(i) A rocket parachute flare showing a red light. 
The use of any of the above signals, except for the purpose of 
indicating that a vessel or a seaplane is in distress, and the use of any 
signals which may be confused with any of the above signals, is 
prohibited. 
Note.—A radio signal has been provided for use by vessels in distress 
for the purpose of actuating the auto-alarms of other vessels and thus 
securing attention to distress calls or messages. The signal consists 
of a series of twelve dashes, sent in 1 minute, the duration of each dash 
being 4 seconds, and the duration of the interval between two consecu-
tive dashes 1 second. 
RULE 32 
All orders to helmsmen shall be given in the following sense: right 
rudder or starboard to mean "put the vessel's rudder to starboard"; 
left rudder or port to mean "put the vessel's rudder to port." 
Approved October 11, 1951. 
Public Law 173 
CHAPTER 498 
AN ACT 
October 12, 1951 
IS. 1994] 
To authorize the use of the incompleted submarine Ulua as a target for explosive 
tests, and for other purposes. 
Be it enacted hy the Senate and House of Representatives 
of the 
use'^oP^su^bmartae United States of America in Congress assembled, That notwithstand-
uiua as target. 
ing the proviso of title I I I of the Second Supplemental Surplus 
65 STAT.] 
PUBLIC LAW 176—OCT. 16, 1951 
421 
Appropriation Rescission Act, 1946, under the heading "Increase and 
replacement of naval vessels, emergency construction" (60 Stat. 227), 
the Secretary of the Navy is authorized to employ the incompleted 
submarine Ulua (SS-428) as a target for explosive tests in order to 
gather research data for new weapon and submarine design. 
SEC. 2. Upon conclusion of the explosive tests, the Secretary of the 
Navy may, in his discretion, sink the Ulua if considered unseaworthy, 
or retain the Ulua and make such repairs as will equip the Ulua for 
further tests and experimentation, or dispose of her in accordance 
with other provisions of law. 
Approved October 12, 1951. 
Public Law 174 
CHAPTER 499 
AN ACT 
To amend the Veterans Regulations to provide that multiple sclerosis developing 
a 10 per centum or more degree of disability within two years after separa-
tion from active service shall be presumed to be service-connected. 
October 12,1951 
[H. R. 3205] 
Be it enacted hy the Senate and House of Representatives 
of the 
United States of America in Congress assembled^ That the second 
last proviso of subparagraph (c) of paragraph I, part I, Veterans 
Regulation Numbered 1 (a), as amended, is hereby amended by insert-
ing after the words "three years" the words ", or multiple sclerosis 
developing a 10 per centum degree of disability or more within two 
years". 
Approved October 12, 1951. 
38 U. S. 
foil. ch. 12. 
C. note 
Public Law 175 
CHAPTER 501 
AN ACT 
To amend section 9 of the Federal-Aid Highway Act of 1950 (64 Stat. 785), to 
increase the amount available as an emergency relief fund for the repair or 
reconstruction of highways and bridges damaged by 
floods 
or other catastrophes. 
October 15,1951 
[H. R. 5257] 
Be it enacted hy the Senute and House of Representatives 
of the 
United States of America in Congress assembled^ That section 9 of the 
Federal-Aid Highway Act of 1950, approved September 7, 1950 (64 
Stat. 785), is hereby amended by striking out the figure "$5,000,000" 
and inserting in lieu thereof "$15,000,000'\ 
Approved October 15, 1951. 
23 U. S. C. § 13a. 
Public Law 176 
CHAPTER 506 
AN ACT 
To amend further the Act entitled "An Act to authorize the construction of 
experimental submarines, and for other purposes", approved May 16, 1947, 
as amended. 
October 16,1951 
[H. R. 1227] 
Be it enacted hy the Senate and House of Representatives 
of the 
United States of America in Congress assembled, That the proviso 
contained in the Act entitled "An Act to authorize the construction of 
experimental submarines, and for other purposes", approved May 16, 
1947 (61 Stat. 96, chap. 69), as amended by the Act of August 8,1949 
(63 Stat. 577, chap. 405), is further amended by deleting "$41,000,000" 
and inserting in lieu thereof "$49,000,000". 
Approved October 16, 1951. 
Experimental 
marines. 
sub-
34 U. 8. C. § 489.