REPORTS OF THE BUILDING COMMITTEE. 635 



a height of fifteen feet ahove the line of the water table, and for the remaining por- 

 tion two feet, exclusive of all projections. 



The thickness of the walls of the connecting ranges ahove water table will be 

 twenty-two inches, exclusive of all projections. 



The thickness of the clerestory wall of the west range will be sixteen inches, and 

 it will be backed in with good hard brick. 



The thickness of the walls of both wings will, above the water table, be two feet, 

 exclusive of all projections and the batter at the base of the east wing. 



The thickness of the walls of central front towers will be three feet six inches in 

 the first stories, three feet in the second story, two feet six inches in the third story, 

 with the corners filled in to aid in supporting the octagon, and two feet in the fourth 

 story, which will be backed in with good hard brick, exclusive of all projections. 



The thickness of the walls of the central rear tower will be three feet in the first 

 story, two feet six inches in the second story, and two feet in the third story, 

 exclusive of all projections. 



The thickness of the walls of the campanile, exclusive of all projections, will be 

 two feet to the line of the roof of the main building, and above this line twenty 

 inches, and backed in with best hard brick. 



The thickness of the walls of the octagonal tower will be two feet three inches to 

 the line of the roof, and twenty inches above the line of the roof, and backed in with 

 brick, exclusive of the batter at the base and all projections. 



The thickness of the walls of the remaining towers will be two feet on an average, 

 exclusive of all projections, and the stories above the roofs will be backed in with 

 brick. 



All the remaining walls, if any, to be in no case less than two feet thick, and to be 

 executed by the contractor. 



All the thicknesses above given are exclusive of the brick lining wall. 



Brick Masonry. — All the partition walls which rise above the basement will be two 

 bricks — say 18 inches in thickness — to the height of the floor of the second story, and 

 one and a half brick — say 14 inches in thickness— from thence to the under side of 

 the rafters of the roof. Arches for doors and windows will be turned, of such sizes 

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



All the interior arches behind the window arches, door arches, &c, will be turned 

 in such manner as architect shall direct, to the form .of Norman jambs, to receive the 

 plaster of the jambs. Trimmer arches of brick, nine inches thick, will be turned for 

 all the hot-air and furnace flues in all the floors. 



The arches over the pillars supporting the clerestory of the gallery of art, in the 

 west connecting range, will be of best hard brick, laid to such form as the architect 

 shall direct, and over them a brick wall eighteen inches thick will be carried up to 

 the level of the under side of the roof of the side aisles. 



Groined arches of brick, eight inches thick, will be turned in the most perfect 

 manner for the ceilings of the mezzanine and upper story of the porter's apartments, 

 which will be situated in the lower central front tower ; they will be filled in with 

 spandrils and haunch walls, supporting flag floors of North river flag. If preferred 

 by the contractor, the iron beams, with brick arches between them, hereinafter 

 described, may be used in place of the above groined arches. 



All the remaining brick-work necessary to complete the building to be performed 

 by the contractor, whether specified or not. 



(Jut-stone masonry. — All the cut-stone masonry, of every description, which will 

 be found in the specification of the stone and cutting, will be set by the mason in the 

 most true, perfect, and substantial manner ; and all the iron dowels, clamps, anchors, 

 rods, &c, necessary to secure and render perfect the stone work, will be furnished by 

 the mason ; and the joints of the cut-stone masonry will be pointed in the same 

 manner as above described for the face of building. 



Mortar. — All the mortar for all the above brick, stone, and cut-stone masonry, to 

 be composed of the best hydraulic or ground lime, or of a mixture of hydraulic 

 cement and lime in paste, in such proportions as the architect shall direct, mixed with 

 clean sharp sand, in the best proportions, and thoroughly tempered. 



All the bricks will be well wet before they are used. 



All the stones will be laid on their natural beds, and thoroughly cleaned from 

 dust or dirt before they are laid, and wet, if so directed by the architect. 



Lathing and plastering — All the ceilings and walls, and stud partition walls, of 

 every part of the building, will be lathed to the forms laid down on the plans, or as 

 directed by the architect, with the best sawed laths, five nails to each lath. 



