78 3 ANNUAL REPORT 
hours, the following will be an approximate estimate of the cost of one 
hundred blocks: 
HOUTLMeM Svataplmo Ocal Mile ate a orale aeenl tae ters: Caren enennin $6.75 
CeMeEN ESAS DDL MaERS 2 SOO ea eee tied at ett, Ua are ye 11.60 
Sand: be8 Cl ayiOSua: te pu OU reve ance ar oe okni ay arene ial vice aeun ae als 8.00 
Cost ofione machine: plan) $750 inticat. 695.2... eee (0). 1155 
DEPTECLAtLON es OSGi eau ae eel eee ees) a0 gb dageche ce ny oa na meen eatsaye Mien ees 0.05 
$27.00 
or 27 cents per block equal to brick at $6.75 per 1,000. Using the table 
in Prof. I. O. Baker’s book on Masonry Construction, page 86, the cost 
would be 23% cents per block equal to brick at $5.70 per 1,000. 
Mr. F. E. Kidder,* author of “Architects’ and Builders’ Pocket-Book,” 
made a test of the cost of concrete blocks with a machine of the 
American Hydraulic Stone Company's make during March, 1903. 
The test was made on facing block for a 10 inch wall; two of these 
blocks would lay 9 inches by 24 inches in the wall. The main 
portion of the block was composed of I part cement to 6 parts sand 
and gravel, with a face of I cement to 2 sand. 
Cost Per Square Yard of Wall. 
Labor 1 man, 1 hour 15 min., at $2.00 per day of 10 hrs... $ .25 
Cement; 0573 ‘sack at -$056216 mertsack:. . sa. ccacosoe elec 4834 
4 cu. ft. of sand and gravel at 75c. pepr 1% cu. yds....... .09 
HXtra  COSLsOL TACINSsIMALe iia law anne hee ae ne eke eter oreterenes 014% 
Gost: of twelve: blocks. 4014-4 oe $ .84 
Costiobimonrtarcands layimewles Qhveyid eae ie riere rie cenelanerc tral retea 48 
Cost of hauling blocks to place of conctruction per yd...... 10 
Total’ ‘cost of A sq:nyde of 102inch \wallt ve... wa... $1.42 
He estimated brick layed at $12.50 per 1,000, and adding $30.00 per 
1,000 for pressed brick facing, making no allowance for cut stone trim- © 
mings, the cost for a g-inch brick wall would be $3.57 per square yard, 
and for a 13-inch wall, $4.41 per square yard. 
BRIDGES. 
In bridge building as in other lines of construction concrete has taken 
its place as a permanent structural material. In small country highway 
bridges, the highway commissioner frequently considers himself not only 
able to decide upon the character of bridge to be erected, but also competent 
to design it. Wooden or metal bridges are erected and from the day 
they are finished not a thought is given to their maintenance. They are 
allowed to weather, rot and rust away until some accident occurs or 
*Hing. News, Sept. 17, 1908. 
