166 
ANNUAL REPORT 
Gepending upon the weight of the earth resting upon the lower arm, to 
overcome the thrust of the earth against the upright arm. 
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105.—Section of Retaining Wall, 
See figure 105. 
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Lehman’s System. 
In 1901, Mr. Frank A. Bone constructed a retaining wall upon simi- 
lar lines, but not so light, at Blacklick, Ohio, upon which he 
patents in the United States. 
Fig. 106.—Section of Wing Wall, 
secured 
Figure 106 shows the cross section 
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Bone’s System, 
Constructed at Black Lick, Ohio. 
