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'The contact theory of the Voltaic cell'

Indenture for the purchase of Patent No. 40 of 1 January 1884

Indenture for the purchase of Patent Nos 1464 of 27 March 1882 and 4475 of 6 March 1884

Indenture of transfer of rights in Patent Nos 1464 of 27 March 1882, 4475 of 6 March 1884 and 40 of 1 January 1884

Agreement to change the Purchasers in an agreement of 10 November 1884 regarding the sale of Patent Nos 1464 of 27 March 1882, 4475 of 6 March 1884 and 40 of 1 January 1884

Patent No. 4522 for a process for utilising the spent liquid from certain voltaic batteries

Release from covenants in indenture dated 18 October 1884

Memorandum of Agreement re release of liabilities

Assignment and Release of Patent Nos 1464 and 4475

Voltaic Pile

Drawing of voltaic pile