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MIXING 0 All mixing shall be done by machines, or upon a tight platform. ` `Suitable boxes and al1proportione shall: be obtained by actual meas- urements and no material shal/be used which has not been thus meas- ured. eas cared. The concrete crust stand in the forms and be thoroughly tamped in all, cases. Yo concrete or cement shall be used that s:Iows evidence of hav- ing set or that has become unfit for good work fr or: standing too lone or from any other cause, and no remixing of concrete will be allowed. Under no circumstances shall concrete be put on the work after the initial set has taken place. As soon as possible after the concrete has been placed in the [M forms and before the concrete shall rave taken its final set, a. fin- ish coat or plaster one-half (J) inch thick shall be applied to the surface of the sidewalk and to the top and sides of the curb to a depth of ten (10) inches. Cement mortar for finishing coat for side« w&lk and curb shall be composed of one (1) part cement and one and one-half (li) parts sharp, coarses screened sand. The surface shall tbin. be narked off into blocks not to exceed three (3) feet in length. The contractor shall stamp his name on all sidewalk and curb viork done by him at intervals of not less than one hundred (100) feet on continuous work, and not less than once on each job of less than one hundred (100) feet. The letters shall not be smaller than three foUrths ( ) inches in height and of proportional width* They must be sunken to a depth of not less than one quarter (J) of an inch. Said sidewalk and curb must be covered with earth and thoroughly watered for at least eight (8) days after completion. Sidewalks and curbs must be so constructed that a line drawn from the top of the curb at the face, at right angles to the curb line, to the property line, shall 'rave a uniform rise of one quarter (} inch for every foot of distance from the face of the curb to the property line. The finished surface of the sidewalk must in all cases conform to this grade. Wherever curbing is to be constructed