Engraving depicting a sheer draught (top) and a horizontal plan (below) of a bomb ketch, which is a type of wooden vessel specialized for bombing locations on land. At bottom is a grid with a scale of feet beside it, indicating that every square represents a square foot. Labeled "Vol. 2 Page 485" at top. Title, maker information, and date of publication (31 August 1801) printed in lower margin.
