The school board shall supply a United States and a New Hampshire state flag; the flags shall be made not less than 5 feet in length, with a flagstaff and appliances for displaying the same, for every schoolhouse in the district in which a public school is taught, at the expense of the district. They shall prescribe rules and regulations for the proper custody, care and display of these flags; the regulations shall require that wherever possible, the United States flag and the New Hampshire state flag shall be displayed on separate staffs of equal height. When the flags are displayed on the same staff, the United States flag shall be displayed above the New Hampshire flag. The regulations shall further require that such flags shall be displayed prominently outside of the schoolhouse. When they are otherwise displayed, the flags shall be placed conspicuously in the principal room of assembly of the schoolhouse. The governing board of every private school shall supply a United States flag, such flag to be made not less than 5 feet in length, with a flagstaff and appliances for displaying same. They shall make provisions similar to those required in the public schools for the display of said flag. Any members of a school board or the governing board who shall refuse or neglect to comply with the provisions of this section shall be guilty of a violation.