632 REPORTS OF THE BUILDING COMMITTEE. 



the great lecture-room, shall he excavated to a depth of 5 feet below the same line 

 under the whole building. 



The earth between the foundation trenches of all the towers and the space on the 

 north front between the central towers will be excavated to a depth of 6 inches less 

 than the trenches of the walls. 



All remaining excavation for areas, coal slides, cess-pools, sinks, &c, necessary to 

 complete the building, to be performed by the contractor, and according to the direc- 

 tion of the architect. 



Refilling. — A part of the earth thus excavated shall be thrown back into the 

 trenches, (on the outside of the walls and inside, so far as may be directed,) after the 

 walls are built. It shall be thrown in in layers, and well rammed, so as to prevent 

 all settlement. The remainder of the earth shall be removed and leveled off in such 

 places and in such manner as may be directed by architect. 



Outside excavation. — All the excavation necessary to bring the present surface of 

 the ground to a level with the top of the foundation wall at the building, and to slope 

 it in every direction for drainage, for a width of GO feet (sixty feet) from the build- 

 ing, in every direction, will be performed by the contractor. 



Grubbing and clearing. — All the sod, roots, and in general all vegetable mould and 

 perishable matter, shall be removed from the whole area covered by the building. 



And, in general, all excavation, refilling, grubbing, and clearing, necessary to 

 complete the building in every respect, will be performed by the contractor, in accord- 

 ance with the directions of the architect. 



Masonry in foundation — concrete. — Under all the walls of the building a founda- 

 tion course of concrete masonry, which shall be made by mixing two parts of best 

 hydraulic cement with one part of lime in paste, with eight parts of clean sharp 

 sand, which shall be thoroughly mixed and well tempered, and nine parts of broken 

 stone, not exceeding two and a half inches in diameter. The whole shall then be 

 thoroughly mixed, and well tempered, and laid in courses of six inches, and shall be 

 well rammed, when laid, with a heavy maul, so as to insure the perfect solidity of 

 the whole mass. 



The concrete shall be laid to the following dimensions, under the different parts of 

 the building : 



A. — Under the two central front towers twelve (12) feet wide on bottom, ten (10) 

 feet wide on the top, and two (2) feet in thickness, under all the walls and buttresses. 



B. — Under the central rear tower, and the campanile and octagonal towers, ten 

 feet wide on the bottom, eight feet wide on top, and two feet in thickness, under all 

 the walls and buttresses. 



C. — Under all the remaining towers, eight feet wide on the bottom, six feet wide 

 on the top, and one foot six inches in thickness. 



D. — Under the walls and buttresses of the central building, six feet wide on the- 

 bottom, five feet wide on the top, and one foot in thickness. 



E. — Under the connecting ranges and principal partition walls, four feet six inches- 

 wide on the bottom, three feet six inches wide on the top, and one foot in thickness. 



F. — Under the wings, five feet wide on the bottom, four feet wide on top, and one- 

 foot in thickness. 



G. — Under the piers supporting the clerestory columns of the gallery of art, six 

 feet six inches square on the bottom, five feet square on the top, and two feet in thick- 

 ness. 



H. — Under all the remaining piers, for the columns of the library and the lesture- 

 room, five feet square on the bottom, four feet square on the top, and one foot six 

 inches in thickness. 



Stone masonry in foundation. — The masonry of the foundation shall be laid of 

 large, well shaped, gneiss building stone, of the best quality, with level beds and 

 builds, laid in courses, with strong bond. The stones shall be of large size, not less 

 than three feet in length ; the beds shall be hammered true and even, and the joints 

 brought close together. All the joints shall be filled completely with mortar and 

 spaulls, so as to leave no cavities which might endanger the stability of the walls, 

 and the outside joints shall be well pointed. 



The foundation shall be laid of the following dimensions of cross section, under 

 the different portions of the building : 



A. — Under the central front towers — 1st, a course nine feet wide and two feet 

 thick ; 2d, a course seven feet wide and two feet thick ; 3d, a course five and a half 

 feet wide and two feet thick. 



