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W. J. Cracknell presided over the mobilisation of a vigorous telegraph growth, pushing lines out of Brisbane along the coast north to Bowen and Cardwell and inland to serve the spreading pastoral settlements. He was almost successful in having a overland line to connect to the cable from Java to Port Darwin and had arranged an exploratory expedition to survey a route from Cardwell to Normantown. He thought this was in the bag until the South Australian government agreed to built the Port Darwin to Port Augusta overland line which was shorter.
William carried out the first telephonic experiments in the colony on 26 January 1878 beating Dr.Severn to the post by two days. He used roughly fashioned telephones for the experiments which were not well adapted for the purpose, even though though fair results were obtained. W.J. was not satisfied with his crude instruments and securing a promise of two of his improved models direct from Professor Bell himself, informed the Queensland parliment on 11 March 1878 that further experiments of this scientific wonder would be made on their arrival