VITRIFIED BEICK AS MATERIAL FOR COUNTRY ROADS. 21 
determined in several instances, but have usually been so small as 
to make the probable terms of service appear almost indefinite. It 
is evident, however, that in order to secure the full benefit of this 
excellent resistance to wear the surface of the pavement must not be 
permitted to become uneven because of the failure of isolated bricks. 
TYPICAL SPECIFICATIONS FOR THE CONSTRUCTION OF BRICK ROADS. 
Engineer. — The term " engineer," as hereinafter employed, shall 
be understood to mean the engineer authorized by the officials 
legally responsible for the proposed improvement. The engineer 
will furnish all lines and grades, set all necessary stakes, and furnish 
estimates of the work done upon which to base both partial and 
final payments. All instructions necessary to give effect to any 
part of these specifications will be furnished by the engineer, and his 
decision concerning all matters herein left to his judgment shall be 
final and conclusive. 
Plans and drawings. — All plans and drawings furnished by the 
engineer which show the general location, profile, details, and dimen- 
sions of the proposed road are hereby made a part of these specifica- 
tions, and the work shall in all respects conform to these plans and 
drawings, except that such modifications as in the judgment of the 
engineer are made necessary by the exigencies of construction may 
be made from time to time. On all drawings figured dimensions are 
to govern in cases of discrepancy between scale and figures. 
Grading and subgrade. — All rubbish, stumps, trees, and. other 
encumbrances which occur on the line of the work shall be removed 
by the contractor at his own expense. 
The roadbed shall be graded to conform to the lines, cross sections, 
and grades furnished by the engineer. Embankments shall be con- 
structed of a good quality of soil or other material satisfactory to the 
engineer. They shall be built up in layers not exceeding 12 inches 
in thickness, and each layer shall be thoroughly compacted by means 
of a roller weighing not less than 10 tons, or by some other means 
which the engineer has previously approved. 
All soft, spongy, or otherwise objectionable material encountered 
in preparing the subgrade shall be removed and replaced by other 
material satisfactory to the engineer. In excavating the contractor 
shall exercise care not to disturb any material lying beneath the sub- 
grade, as shown on the drawings furnished by the engineer, except 
in removing objectionable material as above provided. 
The entire subgrade shall be rolled with a roller weighing not less 
than 10 tons, and when complete shall be firm and hard. It shall 
conform in cross section to the proposed surface of the finished road- 
way and be at the required depth below it. 
