Correspondence and papers concerning telegraphic communications, including several diagrams of galvanic wires in the Galvanic Room, basement and Front Court at the Royal Observatory, Greenwich; papers on galvanic circuits connected to clocks at the Royal Observatory; maps of principal galvanic wires in the Observatory Park and grounds; material on connections to the South Eastern Railway; papers on American transit equipment and telegraphs; patents for electric clocks by Messrs Barwise and Bain and C. Shepherd; papers dealing with the return signal of the Deal Time Ball; sketches of galvanic arrangements; a plan for the regulation of clocks; and papers on galvanic adjustments and proposals for telegraphic communications at Adelaide, with plans. The correspondents include C.V. Walker, J. Glaisher, J.C. Clark, E. Dunkin, W. De La Rue, W.C. Bond, A. Bain, G. Fisher, J.H. Farrer, H. Merivale and H.A.E.A. Fayé.