47
The propress, advantage of rendering with at all events this portion of the work, independent of a material to. ¡be imported from England which would be liable to partial damage in Fansil, and the dates of its arrival in the Colony be subject to some viregularities. Thon going into the question of cost however, based won the rates furnished in the Appendices attached to the Memorandum, I find that by
mitting the courses of granite marted xxx at the bach of the ashear face (see Fig. 2 Frawing 3) a face of granite ashear, with a backing of Portrand cement concrete, may be provided al- about the same cost-as in the case of the wall suggested by In? Price, and as there can no question that the Portand
Eve
cernent
cement backing would be very
much
Superior
to the time I
Would recommend, notwithstanding the drawbacks referred to as attendant abon the use
O
foreign material, that the Wall with a cement back should be a dosted.
face
Fig: shews the details of the Vall referred to, the granite ashar would be of the same description As in the case of Fig: 2, bur would be set throughout in Portland Cement, the back and face of each beven being pointed up and the joints run in solid with Polland cement grout. Nichs, or grooves, should be cut in the side points to form joggles when filled Quit grout and pebbles. The Courses & Granite ashear would consist-
of header and Stretcher bloens
Alternately