=Reinforced-concrete work= is also often measured by the cubic yard, although sometimes it is contracted for as a finished building. The steel reinforcement is sometimes included in the price. Often, patented steel reinforcement is bought separately and delivered to the contractor; at other times, the contractor buys the patented steel or else makes it and pays a royalty to the holder of the patent. Reinforced-concrete floors are sometimes measured by the cubic yard and sometimes by the square yard, according to agreement. Pavements are usually measured by the square foot or by the square yard. In Table II are given the costs of stone concrete and gravel concrete. These figures do not include builder’s profit, cost of superintendence, or cost of forms. They are based on the following costs: Labor, 25 cents per hour; cement, $2 per barrel; sand, $1.50 per cubic yard; crushed stone, $1.65 per cubic yard; gravel, $1 per cubic yard. To the values given in the table, the price of the wooden forms, both for material and erection, must be added. This of course varies considerably, according to whether the work is straight or has a number of corners and openings in it. TABLE II COST OF PLAIN STONE CONCRETE ===================+===================+=============================== Mixture | Quantity | Cost ------+-----+------+------+-----+------+------+-----+------+-----+----- Cement|Sand |Broken|Cement|Sand |Broken|Cement|Sand |Broken|Labor|Total Parts|Parts| Stone| Bar- |Cubic| Stone| | | Stone| | | | Parts| rels |Yards| Cubic| | | | | | | | | | Yards| | | | | ------+-----+------+------+-----+------+------+-----+------+-----+----- 1 | 2 | 4 | 1.5 | .45 | .90 |$3.00 |$.68 |$1.49 |$.75 |$5.92 1 | 3 | 5 | 1.1 | .50 | .85 | 2.20 | .75 | 1.40 | .75 | 5.10 1 | 3 | 6 | 1.0 | .45 | .90 | 2.00 | .68 | 1.49 | .75 | 4.92 ------+-----+------+------+-----+------+------+-----+------+-----+----- COST OF PLAIN GRAVEL CONCRETE -------------------+-------------------+------------------------------ Mixture | Quantity | Cost ------+-----+------+------+-----+------+------+----+------+-----+----- Cement|Sand |Gravel|Cement|Sand |Gravel|Cement|Sand|Gravel|Labor|Total Parts|Parts|Parts | Bar- |Cubic|Cubic | | | | | | | | rels |Yards|Yards | | | | | ------+-----+------+------+-----+------+------+----+------+-----+----- 1 | 2 | 4 | 1.3 | .4 | .80 |$2.60 |$.60|$ .80 |$.75 |$4.75 1 | 3 | 5 | 1.0 | .5 | .80 | 2.00 | .75| .80 | .75 | 4.30 1 | 3 | 6 | .9 | .4 | .85 | 1.80 | .60| .85 | .75 | 4.00 ======+=====+======+======+=====+======+======+====+======+=====+=====