206 



below the grade of the walk. A layer of concrete one foot in thick- 

 ness was laid, and upon this the masonry commenced. The masonry 

 of this structure was completed late in the season. The wood work 

 is not yet complete. 



To render this archway impervious to moisture, great care was 

 taken to fill all the joints well with mortar, then a coating of cement 

 mortar was smoothly and evenly laid over the entire outside of the 

 arch and walls. When this had become hard, two coats of asphalt 

 were applied ; next to this, on the vertical walls, a layer of clay 

 puddle, one foot in thickness, was placed. This extended upon the 

 inclined backing of the arch, and was reduced in thickness to a thin 

 edge at the top. Outside of the layer of clay was carried up a dry 

 rubble stone wall, about one foot thick, and outside of this the earth 

 filling. 



At the base of this rubble wall, which extends one foot below the 

 grade of the walk, there was laid a tile drain connecting with silt 

 basins at either end of the bridge. 



The last layer of asphalt on the crown of the arch overlaps the 

 thin edge of the puddle wall, and thus carries all water which 

 reaches it outside of the puddle, and directly into the dry wall, 

 whence it finds its way into the drain without coming in contact with 

 the masonry. 



CULVERT ARCH. 



In addition to the above masonry, a culvert arch has been con- 

 structed in connection with the Deer Paddock pool, and is located 

 between it and the Battle Pass pool. The foundation is of cement 

 concrete, one foot in thickness. The interior work is constructed of 

 gneiss rock, and is coursed rubble masonry. The facing is of Ohio 

 and Belleville sandstone. 



WALKS. 



For gravel walks, the sub-grade was fixed at twelve inches below 

 the finished grade ; the surface at sub-grade was made to conform 

 accurately to the finished cross-section and grade of the walk, and 

 thoroughly rolled. Upon this sub-grade seven inches of rubble 

 stone were laid, upon this two and a half inches of coarse park gravel, 

 and this was followed by one and a half inches of finer park gravel. 

 The depth of stone and gravel at this stage of the construction was 

 ten and one-half inches. The remaining one and a half inches has 

 been, on the walks already constructed, formed of screenings from 

 the McAdam stone. 



