delivered the opinion of the court. He recited the facts in the foregoing language, and continued:
*570It is not denied that up to July 1, 3875, Brown received all the pay to which' he was entitled.
The first contention of the appellant is that the placing of Brown on the retired list was unauthorized by law, and that he was therefore entitled to the full pay of a boatswain from July 1, 1875, up to the time of his death.
§ 23 of the act of August 3, 1861,12 Stat. 291, by authority of which the President assumed to retire Brown, reads as follows :
“That whenever any officer of the navy, on being ordered to perform the duties appropriate to his commission, shall report himself unable to comply with such order, or whenever, in the judgment of the President of the United States, an officer of the navy shall be in any way incapacitated from performing the duties of his office, the President, at his discretion, shall direct the Secretary of the Navy to refer the .case of such officer to a board. . . . The board, whenever it finds an officer incapacitated for active service, will report' whether, in its judgment, the incapacity resulted from long and faithful service, from wounds or injury received in the line of duty*' |rom sickness or exposure therein, or from any other incident of service ; if so, and the President approve of such judgment, the disabled officer shall thereupon be placed upon the list of retired officers, according to the provisions of this act. But if such disability or incompetency proceeded from other causes, and the President concur in opinion with the board, the officer may be retired upon furlough pay, or he shall be wholly retired from the service with one year’s pay, at the discretion of the President; and in this last case his name shall be wholly omitted from the Navy Register. . . ,”
The appellant asserts that this section applies only to commissioned officers, and not to warrant officers, to which latter class Brown belonged.
It must be conceded that were the question a new one, the true construction of the section would be open to doubt. But the findings of the Court of Claims show that soon after the enactment of the act the President and the Navy Department construed the section to include warrant as well as commissioned offi*571cers, and that they have since that time uniformly adhered to that construction, and that under its provisions, large numbers of warrant officers have been retired. This contemporaneous and uniform interpretation is entitled to weight in the construction of the law, and in a case of doubt ought to turn the scale.
In Edwards v. Darby, 12 Wheat. 206, it was said by this court that “in the construction of-a doubtful and ambiguous law the contemporaneous construction of those who were called upon to act under the law, and were appointed to carry its provisions into effect, is entitled to great respect.” This case is cited upon this point with approval in Atkins v. Disintegrating Co., 18 Wall. 272, 301; Smythe v. Fiske, 23 Wall. 374, 382; United States v. Pugh, 99 U. S. 265; and in United States v. Moore, 95 U. S. 760, 763. In the case last .mentioned the court said that “the construction given to a statute by those charged with the duty of executing it . . . ought not to be overruled without cogent reasons. . . . The officer^ concerned are usually able men and masters of the subject. Not unfrequently they are the draftsmen of the laws they are afterward called upon to interpret.” And in the case of United States v. Pugh, the court said: “ While, therefore, the question,” the construction of the abandoned and paptured property act, “ is one by no means free from doubt, we are not inclined to interfere at this late day with a rule which has been acted upon by the Court of Claims and the Executive for so long a time.” See also United States v. State Bank of North Carolina, 6 Pet. 29; United States v. Alexander, 12 Wall. 177; Peabody v. Stark, 16 Wall. 240; and Hahn v. United States, 107 U. S. 402.
These authorities justify us in adhering to the construction of the law under consideration adopted by the executive department of the government, and are conclusive against the contention of appellant, that § 23 of the act of August 3,1861, did not apply to warrant officers.
The appellant next contends that the retirement of Brown was illegal, because at the time of his retirement no officer could be placed on the retired list for disability not originating in the line of duty. The theory of this contention seems to be this: the statute required that all officers retired for disability *572or incompetency not resulting from long and faithful service, or wounds or injuries received in the line of duty, or from sickness or exposure therein, should be retired on furlough pay, and, as §§ 3,5 and 19 of the naval appropriation act of July 15, 1870, 16 Stat. 321, abolished the furlough pay list, the President was only authorized to retire Brown. wholly from the service with one year’s pay. We think it is clear that the sections of the statute referred to were not intended to abolish the furlough pay list. So far as they refer to retired officers they apply to the retired list, and not to the retired list on furlough pay. For thirty years the legislation of Congress has divided retired naval officers into two classes. By §2 of the act of February 28, 1855, 10 Stat. 616, the officers on the retired, or; as it was then designated, reserved list, were divided into .those entitled to receive leave of absence pay and those entitled to receive furlough pay. The distinction between the two classes of retired officers has been preserved down to the present time. Thus, in § 3 of the act of January 16,1857,11 Stat. 154, it was provided that the President should be authorized to transfer any officer from the furlough to the reserved pay list. By § 23 of the act of August 3, 1861, 12 Stat. 290, 291, by virtue of which Brown was retired, it was provided that officers incapacitated for active service from long service, wounds, etc., should be placed on the list of retired officers, bnt those incapacitated from other causes should be retired upon furlough pay. So, by § 2 of .the act approved July 28,1866,14 Stat. 345, it was provided that the rate of pay of officers of the navy on the retired list, and not on duty, nor retired on. furlough pay, should be one-half the pay to which such officers would be entitled if on duty at sea.
This legislation has been reproduced in the Revised Statutes, where the distinction between officers bn the retired list and officers on the retired list on furlough pay is preserved. Thus, §§ 1588 and 1592 prescribe one rate of pay for retired officers, and § 1593 a different rate for officers on the retired list on furlough pay, and § 1594 authorizes the President, by and with the advice, and Consent of the Senate, to transfer any officer of the navy on the retired list from the furlough to the retired *573pay list. It is plain, therefore, that § 5 of the act of July 15, 1870, relied on by appellant, and which is the only one which refers to the pay of retired officers, applies in both its terms and meaning only to the pay of officers on the retired list, and not to the compensation of officers retired on furlough pay, to which class Brown belonged, and did not abolish the furlqugh pay list. The order of the President retiring Brown on furlough pay was, therefore, made strictly in accordance with the provisions of the statute then and still in force.
It is next objected that the order of the President retiring Brown was illegal and void, because the retiring board having reported him incapacitated, did not find and report what was the cause of his incapacity, but only that there was no evidence that it was the result of any incident of the service. But as it is incumbent on the officer whose case comes before a retiring board to show, in order to secure a report which will entitle him to be placed on the retired list rather than on the retired list on furlough pay, that his incapacity, was the result of some incident of the service, the report of the board that there was no evidence to support such a finding is to all intents and purposes a report that the incapacity was not the result of an incident of the service, and justifies an order retiring the officer on furlough pay. But if there had been any irregularity or defect in the report of the board it was the duty of Brown to object to it without unreasonable delay. After his acquiescence in the proceedings during the remainder of his life, it does not lie with his administratrix to object to them, even for a substantial defect, much less for such an irregularity, if it be an irregularity, as is set up in this case. Our opinion is, therefore, that the order pf the President retiring Brown was authorized by law, and was regular and valid.
Appellant next insists that, conceding the retirement of Brown to be valid, he did not receive, after July 1st, 1875, the pay to which he was entitled. It is contended, first, that he should have been paid according to the provisions of § 5 of the act of July 15, 1870, 16 Stat. 333, now forming the last clause in § 1588 of the Revised Statutes. This enactment provides that officers on the retired list shall receive one-half the sea-pay *574allowed to the grade or rank which they held at the date of their retirement. But we have seen that Brown did not belong to the general list of retired officers, but to a distinct class, namely, officers retired on furlough pay. His case, therefore, fell under the enactments embodied in § 1593 of the Revised Statutes, which fixed his pay at one-half that to which he would have been entitled if on leave of absence on the active list. This is the rate at which he has been paid. It is next said that, conceding that his pay was fixed by § 1593, he should, after his retirement, have received the increase of pay allowed officers on the active list for length of service by § 1556 of the Revised Statutes, page 267, commonly known as longevity pay, which, after July 1, 1875, would have entitled him to $600 per annum instead of the $500 which he actually received. This last contention has been decided adversely to the view of the appellant by this court, at the present term, in the case of Thornley v. United States, ante, page 310. We are, therefore, of opinion that Brown was paid, in his lifetime, all that he was entitled to receive under the laws then in force. The judgment of the Court of Claims dismissing his petition was therefore right, and is
Affirmed.