Sir William Hamilton conducting their Sicilian Majesties to see the current of lava from Vesuvius
Pen and brown ink over black pencil lines, bistre wash
8 ½ × 15 ½ inches · 215 × 395 mm
Engraved: William Hamilton, Observations on the Volcanos of the Two Sicilies, As They have been communicated to the Royal Society of London, by Sir William Hamilton, Naples, 1776, Plate XXXVIII.