The decision of a majority of the district board on any question shall be deemed the decision of the board and final. If any member of the board shall dissent from any such decision and shall desire to protect himself from the consequences which may result from such decision, such member may record his dissent, in cases relating to registration, in the register, and in all other cases, in the poll book of such election, signing his name to such record with his own hand, and unless he shall do so, he shall be deemed to have assented to the decision so made.