MS
242
The The experience gained, during the construction of the pedestal, of the excellence of the Portland bement sent out by your Department, as used in the proportion of 7 to I, emboldened the Surveyor Several to suggest that in the superstructure of the Dam a considerable saving
upon the total cost might safely be obtained by the use of concrete
8 to 1, and by the insertion
of
of
blocks
of stone, in the body of the work but adhering to the
use
of rich concrete and free from blocks for an
of 6 feet on the reservoir side.
average
thickness
This form of construction received my sanction, and the Surveyor Several reports that the result is quite satisfactory, the proportion of large blocks of stone
being about 50 per cent of the whole-
fare seems to be taken in the arranging of these large blocks and the packing of them into the
work, but no mention is made of the use of cement
mortar