30 BULLETIN 586, TJ. S. DEPARTMENT OF AGRICULTURE. 
Table 35. — Condition Record, March, 1917 — Continued. 
Metal. 
Struc- 
ture No. 
Location. 
109 
Station. 
168+00 
62 
1419 
75 
109 
1765+35 
168+00 
110 
112+50 
131 
777+00 
98 
466+60 
131 
777+00 
143 
937+00 
97 
476+10 
128 
143 
726+00 
937+00 
103 
355+00 
148 
1012+00 
149 
1018+00 
Position. 
Condition, March, 1917. 
Ungalvanized Bessemer steel... 
Do 
Do 
Ungalvanized open-hearth steel. 
Do ;.. 
Do 
Ungalvanized copper - bearing 
steel. 
Do 
Do 
Ungalvanized copper-bearing iron 
Do 
Do 
Ungalvanized ingot iron 
Do 
Do 
South 
North center . 
South 
North 
South 
....do 
North 
South center. 
Under con- 
crete cross- 
ing. 
South. 
Considerably rusted and start- 
ing to scale slightly. Rust re- 
moved with effort, and de- 
terioration of metal noted to a 
small extent on scaled spots. 
Slight coating of rust, easily re- 
moved. No scale or deteriora- 
tion of metal noted. 
Do. 
Slight coating of rust, easily 
dusted off. No scale or dete- 
rioration of metal noted. 
Considerably rusted and starting 
to scale slightly. Rust re- 
moved with difficulty, and de- 
terioration of metal noted to a 
small extent on scaled spots. 
Considerably rusted. Coating 
removed only with effort. No 
scaling or deterioration of metal 
noted. 
Slight coating of rust easily 
dusted off. No scale or de- 
terioration of metal. 
Considerably rusted. Coatingre- 
moved only with effort. No 
scaling or deterioration of metal 
noted. 
Considerably rusted. Coating 
easily removed. No scaling or 
deterioration of metal noted. 
Slight coating of rust, easily 
dusted off. No scale or de- 
terioration of metal noted. 
Do. 
Considerably rusted. Coating 
easily removed. No scaling or 
deterioration of metal noted. 
Considerably rusted and start- 
ing to scale slightly. Rust re- 
moved with effort, and de- 
terioration of metal noted to a 
small extent on scaled spots. 
Considerably rusted. Coating 
of rust easily removed. No 
scaling or deterioration of 
metal noted. 
Considerably rusted. Coating 
removed only with effort. No 
scale or deterioration of metal 
noted, but certain few spots 
indicate early formation of 
SUPPLEMENTARY REPORTS OF EXPERIMENTS PREVIOUSLY 
REPORTED. 
The following reports are in continuation of others already pub- 
lished by the department in the annual " Progress Reports of 
Experiments in Dust Prevention and Road Preservation. " It was 
decided to abandon the experiments at Ames, Iowa, and Knoxville, 
Tenn., but the histories of these experiments as well as of several 
others are summarized with the supplementary reports, so that the 
results obtained may be studied conveniently by those interested. 
In all cases references are made to the earlier publications in which 
reports regarding the various projects have appeared. 
