Rules as to signature

(1) Every such will shall, so far only as regards the position of the signature of the testator, or of the person signing for him as aforesaid, be deemed to be valid, if the signature is so placed at, or after, or following, or under, or beside, or opposite to the end of the will that it is apparent on the face of the will that the testator intended to give effect by such his signature to the writing signed as his will.