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Section showing the Principle of Construction [Beacon of Progress]

Major collection: Architecture & Design
Named collection: Désiré Despradelle Collection
Object type: drawing
Maker: Despradelle, Constant Désiré
Date made: 1893 - 1900
Materials: graphite; ink; trace paper; paper
Site location: Chicago, Illinois
Measurements: 8 3/4 in x 21 in; 48 in x 35 3/4 in; 31 in x 19 1/2 in
Plan type/view: plan; section; detail elevation

The top drawing, numbered in graphite pencil in lower right as "1", is a "Section Showing the Principles of Construction" and includes two plans. It is inscribed "Result of Calculation considering the shaft to be of granite practically solid with passages shown in section. Volume of shaft A.B.C.D. considered as solid 25,000,000 cu. ft. = 100%. Volume of interior space...3,886,000 cu. ft. = 12 1/2%. Volume of material...22,140,000 cu. ft. = 87 1/2 %. Weight of material @ 181 lbs per [] ft... 2,000,000 tons. Weight of material at base per [] ft... 40 tons. The wind pressure gives an addition of 2 tons per [] ft. The maximum pressure at the base will be 42 tons per [] ft. The full security of construction is shown when it is considered that the crushing strength of granite as determined by government tests varied from 860 to 1510 tons per sq. ft." The bottom drawing, numbered in graphite pencil in lower right as "2", is a detail elevation showing the lower portion of the monument.


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thumbnail Despradelle, Constant Désiré

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thumbnail Beacon of Progress