A complete edition of Faraday's approximately 4900 extant letters in six volumes, published by the Institution of Engineering and Technology (formerly the Institution of Electrical Engineers) under the editorship of Frank James at the Royal Institution. The project has taken over twenty years to complete with volume 1 published in 1991 and volume 6 in December 2011.
Brief overviews of each volume are given below.
1811-1831, letters 1-524
1832-1840, letters 525-1333
1841-1848, letters 1334-2145
1849-1855, letters 2146-3032
1855-1860, letters 3033-3873
1860-1867, undated and newly discovered letters 3874-5053