18. Subsequent conveyance or other acts not to prevent operation of will

No conveyance or other act made or done subsequently to the execution of a will of or relating to any real or personal estate therein comprised, except an act by which the will shall be revoked as aforesaid, shall prevent the operation of the will with respect to the estate or interest in the real or personal estate as the testator shall have power to dispose of by will at the time of his death.