Plate, telescope with plano-convex cylindrical lens by unknown artist Figure 2 showing a telescope with a plano-convex cylindrical lens viewed from the side. Various parts of the telescope are labelled with letters which correspond to explanations in the text. Subject: Astronomy Published in Philosophical Transactions as 'On the spectra of some of the nebulœ. A supplement to the paper “On the spectra of some of the fixed stars"'. Later manuscript emendation indicates that the paper was communicated by either Professor [George Gabriel] Stokes or Dr [William Allen] Miller. Received by the Royal Society on 8 September 1864. 1864