18
free from seams, cracks, and shakes. The stones will be laid on their quarry beds in regular courses, no course to be less than 12 inches in height. Each course shall be composed of headers and stretchers, and at least one-third of the face length of each course shall be headers. The headers and stretchers shall be regularly distributed in each course, so that the headers shall alternate in position in the adjacent courses and so that each stone shall break bond not less than 12 inches with the stone above and below. A gamut or plan of each course will be prepared and submitted to the engineer before the stones are laid and, if approved by him, will be used for the guidance of workmen in laying the stones. This will be quarry-faced work. Each stone will have a distinct pitch line all around the face. The bed and build joints will be fine pointed to a fair, true surface, out of wind, 9 inches back from the pitch line. The remainder of the bed and build joints to be pointed, so as not to project beyond the plane of the fair, true surface and not to fall away therefrom more than 1.5 inches. The width of the stretchers on their beds will not be less than their height. No stretcher will be less than 3 feet in length. The headers will not be less than 30 inches on the face nor less than 4 feet in length. This work will be laid with full mortar joints on the beds. The mortar will be pressed or tamped into the build joints with a proper tool. After the work is laid the mortar will be raked out of all the exposed joints to a depth of 1.25 inches, and these joints will be pointed with mortar of neat cement pressed in and rubbed hard.
16. In measuring this work, the headers will be accounted 4 feet long. The
width of each stretcher will be considered equal to its height. No stone of less
dimension will be laid. If stones are laid exceeding these dimensions the excess
will be paid for as rubble filling.
17. The downstream face of the dam is to be laid with granite of good quality,
sound and free from imperfections. It will be laid in regular courses; no course
to be less than 12 nor over 30 inches high. Each course shall be composed of
headers and stretchers, and at least one-third of the face length of each course
shall be headers. The headers and stretchers to be regularly distributed in each
course, so that the headers shall alternate in position in the adjacent courses, and
so that no stone shall break bond less then 12 inches with the stone above and
below. The stretchers to be as wide as high, measured on the lower bed. No
stretcher to be less than 3 feet; no header to be less than 3 feet on the face and 4.5
feet long. On the curved part of the face, except at the toe, the bed joints shall
be radial. On the vertical and battered part they will be horizontal. Dowels and
clamps of Wrought iron will be inserted at the toe as directed by the engineer.
18. The exposed faces of all these stones are to have distinct pitch lines all
around. The face not to project or recede more than 1.5 inches from that line.
The beds and builds to be pointed off to lay a three-fourth inch joint for 12-inch
back from the pitched line.
19.
If this work is laid with fossiliferous marble, the specifications will be the same in every respect as for granite, except that the beds and builds will be dressed to a 0.125 inch joint instead of a 0.75 inch joint. Bids will be received for either kind of stone. A gamut or plan of each course will be prepared as specified for the upstream face.
20. In measuring this work the headers will be taken as 44 feet long, the stretchers as wide as high, measured on the lower bed. No dimensions less than these will be accepted. If stones of greater dimension are laid, the excess will be paid for as rubble filling. All of this work is to be laid in cement mortar.
RUBBLE MASONRY.
21. Rubble masonry will be laid in the body of the dam. This will be composed
of any firm, strong, and sufficiently heavy stone. It must not weigh less than 150
"
This paragraph is eliminated from specifications.
