202 ANNUAL REPORT 
depth of eight (8) inches after being compacted by wetting and rolling or 
ramming, the surface of the cinder, crushed or screened gravel, foundation to 
be even, parallel to the proposed pavement surface and four (4) inches 
below it. 
Concrete. —Upon the foundation will be placed a layer of concrete. This 
concrete will be spread and rammed to an even surface, parallel to, and one 
(1) inch below the proposed pavement surface before any set in the mor- 
tar can occur; the concrete must be composed of one (1) part, by measure, 
of cement, two (2) parts sand, and four (4) parts broken stone, crushed or 
screened gravel. The cement and sand. will be thoroughly mixed dry and 
then made into mortar with the least possible amount of water. The broken 
stone, drenched with water, will then be incorporated with the mortar. The 
concrete will be thoroughly mixed, the mixing to continue until each frag- 
ment of stone is completely coated with mortar, spread and rammed until 
free mortar appears on the surface, which shall be smooth and one (1) inch 
below the pavement grade. The whole operation of mixing and laying the 
concrete will be performed as expeditiously as possible by a sufficient number 
of skilled men. Platforms or boxes will be used in every case for the con- 
crete bed. 
Wearing Surface. —The wearing surface will be composed of one (1) 
part, by measure, of cement, and one (1) part sand, thoroughly mixed dry, 
with the addition of sufficient clean water to form a stiff mortar. This mortar 
will be evenly spread upon the concrete base before any set can occur in the 
mortar and before the concrete has become dry. The mortar, as soon as 
spread, will be floated and troweled to a true smooth surface at the sidewalk 
grade, neatly and accurately fitted around all openings or immovable objects 
in the sidewalk and along the outside margin. Boxes will be used in every 
case for the mortar bed. 
Blocking.—The surface of the pavement, before the mortar sets, will 
be cut into blocks with a wedge-shaped tool, leaving a clean groove five-eighths 
(54) of an inch deep, one-eighth (144) of an inch wide at the bottom, and one 
quarter (14) of an inch at the top, the cut to be finished with a T shaped 
tool, the object of this being to make firm, smooth, and slightly round the top 
edges of the groove. The blocks will be made with straight sides, gen- 
erally rectangular, measuring, ordinarily, not less than four (4) nor more 
than six (6) feet on a side. The design of the blocking to be subject to 
special direction by the Engineer in each case. The blocking for driveways 
will be done by cutting and finishing as before described, except that the 
grooves will be one-fourth (14) of an inch at the bottom and one-half of an 
inch (14) at the top or pavement surface, the design to be furnished by the 
Engineer, and will generally be in strips six (6) inches wide across the drive- 
way (along the pavement) or in six (6) inch squares. 
Grade of Sidewalk. —The full-width sidewalk, at its junction with the 
curb, will be, unless otherwise ordered by the Engineer, one-half (144) inch 
above the curbing, with a neat bevel and a slight lap. The slope of the 
full width pavement will be three-eighth (%) of an inch per foot, up 
from the curb to the lot line, unless otherwise directed by the Engineer. The 
alignment, elevation, and slope of pavements less than the full width of the 
sidewalk will be subject to special direction from the Engineer in each case. 
Driveways. —The construction of driveways will be with the same materials 
and in the same manner as specified for ‘Paving’ except that the gravel or 
