STATE GEOLOGIST. 93 
Bids were accepted April 14, 1903, upon three different plans of 
sewer construction for the Central Relief and the Beck Street sewers. 
These sewers range from 51 inches to 10 feet 6 inches in diameter. 
Fig. 38.—Outlet of the Relief Sewer, Columbus, Ohio. 
One design was for the customary brick sewer,'another for reinforced 
concrete and a third for plain conerete. But two contractors bid—num- 
ber one accustomed to construct concrete sewers, number two unaccus- 
tomed to such construction. The bidder to whom concrete construction 
was strange bid much higher upon concrete than upon brick. 
Number one’s bid upon concrete was 86.6 per cent. of his bid for brick 
work, and only 85 per cent. of his competitor’s bid upon brick work‘ while 
the bid of number two for concrete was 116 per cent. of his own bid upon 
brick work. | 
The lowest bid was accepted and the work is in progress. Figure 38 
illustrates the outlet end of the 10% foot sewer where it empties into 
the Scioto River. 
ELECTRIC DUCTS. 
Electric wires for light, telephone, telegraph and power are laid 
under ground in many of the large cities in tile or terra cotta pipes. In 
order to protect the wires and insulation from dampness, these pres are 
imbedded in concrete as illustrated in Figure 39. 
