- Email: [email protected]
Particulars of the steamer Mississippi
_Particulars of the Steamer d'~ississippi.
201
sublimate). When well whitened by the action of the salt, it is removed, washed with water, and then with a solution of hydro-sulphate of ammonia, consisting of ten parts of water to one of hydro-sulphate of ammonia of commerce. In this manner the ground of the negative is rendered extremely dense, without affecting the clearness of the detail. When dried and varnished it is ready for use. We now come to the preparations of the sensitive paper. The quality of the paper used is a point of much importance. Various samples have been tried, but that which has been found best suited for the purpose is a semitransparent kind, with a smooth surface, known by the name of engravers' tracing-paper. The next process is the coating of the whole surface of the print with an even and thin layer of a greasy ink, which is composed of the following ingredients :--Middle linseed-oil varnish, 43 oz. ; wax, 4 oz. ; tallow, ½ oz. ; Venice turpentine, ½ oz. ; gum mastic, a~ oz. ; lamp black, 3,~ oz. A portion of the above is dissolved in oil of turpentine, so as to make a solution of the consistency" of thin cream, which is easily applied to the surface of the print with a brush. As soon as the lines are quite clear, the print is placed in a fiat dish, and washed, first with warm, and finally with cold water. When dry, it is ready for transferring to zinc or stone. There are two methods of transferring to zinc, varying according to the quantity of ink on the photograph. If a very small quantity has been applied on account of the closeness of the subject, the print is transferred by the "anastatic" process. For the Journal of the Franklin Institute.
_Particulars of the Steamer MississiTpi. Hull built by Win. It. Webb. Machinery by Morgan Iron Works, New York. Owners, :New York and Savannah Steamship Co. Intended service, :New York to Savannah, Georgia. HgLr~.--Length on deck, 250 ft. Breadth of beam (molded), 38 ft. Depth of hold, 14 ft. 8 ins. Do., to spar deck, 22 ft. 6 ins. Frames--molded, 15 ins., sided, 16 ins.; apart at eentres, 32 ins.; strapped with diagonal and double laid braces, 4] X ~ in. Depth of keel, 9 ins. Two bulkheads. Draft of water, fore and aft, 13 ft, 6 ins. Tonnage, 2070. Area of immersed section at load draft of 13 ft. 5 ins., 468 sq. ft. Displacement at load line, 2525 tons. Masts, two. E~GINEs.--Vcrtieal beam. Cut-off, one-half.
Diameter of cylinder, 80 ins.
L e n g t h of stroke, 11 ft.
BoIL~as.--Two--Return flue. Length of boilers, 30 ft. Breadth do., 13 ft. Height do., exclusive of steam chimney, 13 ft. Number of furnaces, five in each. Breadth do., 3 it. 2 ins. Length of grate bars, 9 ft. Number of flues, above, 7 of 13~- ins. and 7 of 14~: ins.; below, 15 of 15 ins. Length do., above, 22 ft. 6 ins.; below, 15 ft. g-in. Grate surface, 279 sq. ft. Heating surface, 6013 sq. ft. Diameter of smoke pipe, 6 R. 6 ins. Height do., 36 ft. PXDDL~ Wn~ELs.--Diameter overblades, 34 ft. do., 24 ins. N u m b e r do., 28.
Date of trial, May, 1861.
Length of blades, 9 ft. 6 ins.
Depth
C. It. H.
201
sublimate). When well whitened by the action of the salt, it is removed, washed with water, and then with a solution of hydro-sulphate of ammonia, consisting of ten parts of water to one of hydro-sulphate of ammonia of commerce. In this manner the ground of the negative is rendered extremely dense, without affecting the clearness of the detail. When dried and varnished it is ready for use. We now come to the preparations of the sensitive paper. The quality of the paper used is a point of much importance. Various samples have been tried, but that which has been found best suited for the purpose is a semitransparent kind, with a smooth surface, known by the name of engravers' tracing-paper. The next process is the coating of the whole surface of the print with an even and thin layer of a greasy ink, which is composed of the following ingredients :--Middle linseed-oil varnish, 43 oz. ; wax, 4 oz. ; tallow, ½ oz. ; Venice turpentine, ½ oz. ; gum mastic, a~ oz. ; lamp black, 3,~ oz. A portion of the above is dissolved in oil of turpentine, so as to make a solution of the consistency" of thin cream, which is easily applied to the surface of the print with a brush. As soon as the lines are quite clear, the print is placed in a fiat dish, and washed, first with warm, and finally with cold water. When dry, it is ready for transferring to zinc or stone. There are two methods of transferring to zinc, varying according to the quantity of ink on the photograph. If a very small quantity has been applied on account of the closeness of the subject, the print is transferred by the "anastatic" process. For the Journal of the Franklin Institute.
_Particulars of the Steamer MississiTpi. Hull built by Win. It. Webb. Machinery by Morgan Iron Works, New York. Owners, :New York and Savannah Steamship Co. Intended service, :New York to Savannah, Georgia. HgLr~.--Length on deck, 250 ft. Breadth of beam (molded), 38 ft. Depth of hold, 14 ft. 8 ins. Do., to spar deck, 22 ft. 6 ins. Frames--molded, 15 ins., sided, 16 ins.; apart at eentres, 32 ins.; strapped with diagonal and double laid braces, 4] X ~ in. Depth of keel, 9 ins. Two bulkheads. Draft of water, fore and aft, 13 ft, 6 ins. Tonnage, 2070. Area of immersed section at load draft of 13 ft. 5 ins., 468 sq. ft. Displacement at load line, 2525 tons. Masts, two. E~GINEs.--Vcrtieal beam. Cut-off, one-half.
Diameter of cylinder, 80 ins.
L e n g t h of stroke, 11 ft.
BoIL~as.--Two--Return flue. Length of boilers, 30 ft. Breadth do., 13 ft. Height do., exclusive of steam chimney, 13 ft. Number of furnaces, five in each. Breadth do., 3 it. 2 ins. Length of grate bars, 9 ft. Number of flues, above, 7 of 13~- ins. and 7 of 14~: ins.; below, 15 of 15 ins. Length do., above, 22 ft. 6 ins.; below, 15 ft. g-in. Grate surface, 279 sq. ft. Heating surface, 6013 sq. ft. Diameter of smoke pipe, 6 R. 6 ins. Height do., 36 ft. PXDDL~ Wn~ELs.--Diameter overblades, 34 ft. do., 24 ins. N u m b e r do., 28.
Date of trial, May, 1861.
Length of blades, 9 ft. 6 ins.
Depth
C. It. H.