| Title | A Treatise upon aerostatic machines, containing rules for calculating their powers of ascension; a demonstration of the forces which have a tendency to distend or burst them; and an extensive table by which the power and weight of any one, from ten to one hundred feet diameter may readily be found. Also an expeditious method of constructing them of any round form such as a globe, a vase, or an urn: with directions for filling them and making inflammable air etc. etc., by John Southern. Birmingham. |