This is a petition for a writ of mandamus. It involves the election of assessor in the town of Easton at the annual town meeting in March of the current year. A recount of votes cast in the election was duly had by the board of registrars of voters upon proper proceedings. G. L. c. 54, § 135. The present petition was brought against that board by one of the candidates claiming to have been elected. The other chief candidate, Keith (who was found by the registrars to have received the same number of votes as the petitioner), was allowed to intervene as the real party in interest and to conduct the defence. G. L. c. 249, § 5. MacBrayne v. City Council of Lowell, 241 Mass. 380, 384. When the case came on for argument before this court on exceptions allowed by the single justice, a plea in abatement *574was filed by Keith alleging that subsequent to the hearing before the single justice the respondent Hanlon, town clerk and one of the registrars of voters, had ceased to be town clerk and one of the registrars of voters. G. L. c. 41, § 109. Appropriate certificates to that effect were annexed to the plea. Thereupon the plaintiff moved to amend his petition by substituting the present town clerk, one Wood, in place of Hanlon. Counsel appeared representing Wood.
These proceedings, if proper in their essentials, now may be had before the full court, as well as in the trial court. G. L. c. 231, § 125.
The board of registrars of voters consists of four members. The town or city clerk is one by virtue of his office. The three others are members for such terms that one goes out of office each year and his successor is appointed for a term of three years. G. L. c. 51, § 15. Except by some unusual occurrence, there will always be three members of the board. Plainly the Legislature intended that the board should be a continuous body. The case at bar on this point comes within the principle of numerous decisions. Fairbanks v. Mayor & Aldermen of Fitchburg, 132 Mass. 42, 44. Collins v. Mayor & Aldermen of Holyoke, 146 Mass. 298, 306. Taintor v. Mayor & City Council of Cambridge, 192 Mass. 522, 523. Zeo v. City Council of Springfield, 241 Mass. 340, 345.
A writ of mandamus against a single public officer or the head of department or bureau to enforce the performance of official duty is a personal action founded on the fact that the defendant has failed to discharge a personal obligation in connection with his office. Therefore such action, in the absence of a statute to the contrary, commonly must abate upon the death or retirement from office of the original defendant. It cannot be amended by the substitution of his successor, who is not his personal representative and cannot be held responsible for his delinquencies. Where, however, the writ is directed against a continuing municipal board, with a constant official duty, with respect to a delinquency in the execution of such official duty, then, since the power to perform persists in the board, a change of *575one or more of the persons composing the board does not work abatement of the petition but it may be prosecuted against those who are its members, those newly chosen being brought in by amendment in place of those who have vacated office. Knights v. Treasurer & Receiver General, 236 Mass. 336, 338, 339, 340, where cases are collected and reviewed.
It follows that the petition did not abate on the retirement from office of the town clerk, and that the present incumbent of that office may be brought in as a party by amendment.
The facts with respect to the merits of the controversy, as found by the single justice, are in substance as follows: At an election held in the town of Easton for the choice of assessor for the term of three years and for the election of other town officers, the petitioner and one Frank P. Keith were candidates for the office of assessor for three years and their names were respectively printed upon the official ballot used at the election. Upon the returns made by the precinct officers of the various precincts of the town it appeared that Andrews received three hundred and fifteen votes and Keith received three hundred and seven votes. Thereafter a sworn statement of grounds for a recount of the ballots cast for assessor was duly filed with the town clerk and transmitted to the board of registrars of voters, which recounted the ballots, determined the questions raised, and completed their recount as required by law. Upon the recount the registrars found and determined that Andrews received three hundred and sixteen votes and that Keith received three hundred and sixteen votes. The case was submitted to the single justice upon the pleadings, together with six ballots cast at the election. On the ballots in the column of candidates for assessor, the name of the petitioner and the name of Frank P. Keith and the names of four other candidates for that office were printed. The name of Keith was the last printed name of the candidates for assessor; immediately below was the blank space designed according to law for a voter to write a name for assessor other than any of the printed names. Upon four of the six ballots a cross was marked in the square directly opposite the blank space *576and below the space opposite the name of Frank P. Keith. Upon the ballots so marked no name was written in the blank space. These four ballots were counted by the registrars for Keith. The cross on each of these ballots extended from the bottom line of the space to a point slightly above the line between the blank space and the space in the square opposite the name of Keith. The single justice found that the ballots were so marked as to make uncertain the intent of the voters, that the intention of the voters who marked those ballots was left wholly to speculation and conjecture, and accordingly ruled that the registrars were in error in counting these votes for Keith. Of the remaining two disputed ballots it was found that one showed plainly the intent of the voter that it should be cast for Keith, and that the marking upon the other did not disclose the intent of the voter. Having thus found that five of the ballots counted for Keith ought not to have been so counted, the result followed that the petitioner received a plurality of the votes cast and was elected. The preémptory writ was ordered to issue. The respondent Keith “ excepted to the findings and order.” The six original ballots were made a part of the bill of exceptions.
This is a proceeding at law and not in equity. Although the only evidence submitted to the single justice was the six disputed ballots, this court does not stand with respect to the decision of the case where the single justice stood. That principle applies in equity. ■ The question presented to this court in an action at law with full report of evidence, where the trial court has made a decision, is whether that decision can be supported as matter of law on any rational view of the evidence. We do not review and revise that decision. We determine only whether it can be supported in law, or whether as matter of law it must be reversed. Mansfield v. Secretary of the Commonwealth, 228 Mass. 262. Atlantic Maritime Co. v. Gloucester, 228 Mass. 519, 522. Moss v. Old Colony Trust Co. ante, 139, and cases collected in each decision.
The finding of fact that the intent of the voter was not shown by the marking on the crucial ballots cannot be over*577turned by asking us to make a different finding of fact on inspection of those ballots. The question for us to determine is whether there was any evidence to support the finding. Aradalou v. New York, New Haven & Hartford Railroad, 225 Mass. 235, 239.
It is plain from the accurate description of the ballots set forth in the exceptions as well as from inspection of them that the finding was right to the effect that they do not disclose the intent of the voter. The slight extension of the ends of the cross, unmistakably marked in the square opposite the blank, into the square above opposite the name of Keith would not have warranted a finding of a purpose to vote for Keith. O’Connell v. Mathews, 177 Mass. 518, 521. Flanders v. Roberts, 182 Mass. 524, 526. Brewster v. Sherman, 195 Mass. 222, 226.
Plea in abatement overruled.
Amendment of petition allowed.
Exceptions overruled.