Section 42. Any notice required by this Act to be served otherwise

42. Any notice required by this Act to be served otherwise service of than through the Court by `s` party to an arbitration agree- notice part or by manner provided in the arbitration agreement, or ment or by an arbitrator or umpire shall be served in the if there arbiLr- ' is no such provision, either- - (a) by delivering it to the person on whom it is to be served, or - (b) by sending it by post in a letter addressed to that person at his uwal or last known place of abode. - . . . or business in British India and registered under chapter VI of the Indian Post .Office Act., 1898. .