REPORT OF C. C. MARTIN, 



ENGINEER IN CHARGE. 



Park Commission-, City OF BROOKLYN, / 

 Engineer's Office, January 1st, L868. f 



Messrs. Olmsted, Y.wx & Co., 



Landscape Architects and Superintendents. 



( \ i:\n.i \i i:n : — In t lie following report will be found a general descrip- 

 tion oftne work executed on the Park during the year lw(i7. 



Previous to the date of my appointment as Engineer in Charge in 

 May last, the position was held by Mr. J. P. Davis with whom, before 

 assuming its duties, I had such opportunity for consultation, as was 

 necessary to enable me to comprehend the nature and extent of the work 

 that had been carried on in the early part of the year. 



PLAZA. 



Duringthe season the Plaza mounds have been completed, planted and 

 enclosed with a temporary fence, nearly all of the curb lias been set 

 around the interior of the Plaza, and the grading has been done and a 

 portion of the pavement laid. 



ROADS. 



During the season two distinct kinds of roads have been constructed, 

 viz.: the Telford road and the rubble road. The preparation of the 

 road bed, the drainage and the surfacing- are the same for both. 



The road bed is prepared by bringing it to a sub-grade, twenty-seven 

 inches below the finished grade. This is carefully shaped to correspond 

 with the finished road and thoroughly rolled. 



Upon this road bed is placed a layer of the course sand found on tin- 

 Park, twelve inches in thickness, which is properly formed and rolled. 

 Upon this is laid with care a course of Telford blocks, seven inches in 

 depth ; next is a layer of four inches of McAdam stone, and this is fol- 

 lowed by three inches of Roa Hook gravel. 



The rubble road differs from the Telford mainly in the substitution 

 of sound rubble stone in the place of the Telford blocks. 



As water and frost are the great destroyers of roads, one of the first 

 requisites in the construction of a good road is to provide ample and 

 effective drainage, both of the surface and the sub-structure. 



