[Autograph / Antarctic exploration] Sir Ernest Henry Shackleton (1874-1922, Anglo-Irish explorer), an autograph signed typewritten letter on letterheaded paper of The Imperial Trans-Antarctic Expedition, 4 New Burlington Street, Regent Street, London, dated July 29th 1914 and addressed to one C A Hamilton of Cochmo, Duntocher, thanking the addressee for his "generous contribution of £5 towards the funds of the above Expedition", 26.5 cm x 20.5 cm