Section 12: In executing a sentence of solitary confinement, such confinement shall in no case
solitary exceed fourteen days at a time, with intervals between the periods of solitary confinement of
confinement. not less duration than such periods; and when the imprisonment awarded shall exceed three
months, the solitary confinement shall not exceed seven days in any one month of the whole
imprisonment awarded, with intervals between the periods of solitary confinement of not
less duration than such periods.