Triger, for sinking his shaft. Mr. John Hughes ... or under water. It shows a caisson or diving-bell, designed by Messrs. Burmeister and Wain, and adopted by them in building the piers of the ...

MEN who have been working in compressed air, either under water in diving dresses or diving bells, in caissons used in preparing foundations for bridges, &c., or in making shafts or tunnels ...