Note: In presentation John Burgess – John Holland, Submarines and the Influence on the Grubb Telescope Company, at 18 minutes 45 seconds, reference is made to Laurence, the 2nd Earl of Rosse. This is incorrect. The correct reference should be to Laurence, the 4th Earl of Rosse, the eldest son of William Parsons (Leviathan Telescope) and brother of Charles Parsons (steam turbine pioneer).