FRANKLIN INSTITUTE: Explosions of Steam Boilers No. XIV Extract of a letter from the Hon. S. D. Ingham, late Secretary of the Treasury, dated October 21, ... Specification of an improvement on the steam boiler, intended to prevent the explosion of steam boilers, by reason of the great heat in that part of the boiler which is above the water line; and also to give notice of the depression of the water, by the ringing of a bell No. XV Extract of a letter' from Professor James Renwick, of a Columbia College, New York, dated October 27, 1830 No. XVI Extract of a letter from the Hon. S. D. Ingham, late Secretary of the Treasury, dated Nov. 1, l830 No. XVII EXtract of a letter from E. A. Letter. Esq. to the Secretary of the Treasury, dated Boston, November 15, 1830 No. XVIII Anonymous communication received from England, through P. Vaughan, Esq. of London To the Editor of the Staffordshire Advertiser No. XIX To the numbers of the Franklin Institute No. XX No. XXI