—, on the coal field of Carbon creek, xxxix, 137.
—, iron spikes, experiments on the adhesion of, in different kinds of timber, xxxii, 34.f
—, rotascope, description of, xxi, 265.f
—, rotation of liquids of different specific gravities, placed upon each other, xxvii, 84.f
—, on the rapid production of steam in contact with metals highly heated, xix, 292; xx, 308, 418.
—, action between water and hot iron, xxi, 71.f
—, description of a steam pyrometer, xxii, 96.f
—, the strength of cylindrical steam boilers, xxiii, 68.
—, notice of an ancient American utensil, xxiii, 65.f
Johnston, J., improved air pump, xxxiv, 86.f