Roberts 1882–1884 Olaus Henrici 1884–1886 James Whitbread Lee Glaisher 1886–1888 JamesCockle 1888–1890 John James Walker 1890–1892 Alfred George Greenhill
and Edinburgh Philosophical Magazine 1848, p 447 Google books link ^ JamesCockle in London-Dublin-Edinburgh Philosophical Magazine, series 3 1848 On Certain