Two volumes bound as one, third and second editions respectively, the Essays on Practical Mechanics includes a large folding frontis (with closed tear) and three folding plates with 24 figures. The Treatise has eight plates (seven folding) with 98 figures (closed tear to one plate). Both works contain a tipped-in errata slip. Some offsetting in places (particularly from plates) and hinge gaping after first title page, bound in worn half calf with marbled boards.