THE IRRIGATION AGE. 



151 



ROAD CULVERTS AND SYPHONS. 



(Continued from Page 146.) 



wholly dependent on the life of the material from 

 which they are made. 



It is generally conceded that iron or steel rusts 

 in proportion to the amount of impurities present. 

 Iron produced by the painstaking and laborious 

 methods of long ago has endured through many 

 years of trying exposure. The links used in the 

 construction of the Newburyport (Mass.) bridge in 

 1792 are today in an almost perfect state of preser- 

 vation. The reason for this appears when an analy- 

 sis of these old links shows them to have been made 

 from remarkably pure iron. 



Dating from the introduction of the Bessemer 

 process of steel making, tonnage produced at the 

 expense of quality covered the country with struc- 

 tures which have quickly rusted out when exposed 

 to the elements. Analyses show that modern steel 

 is high in impurities. When the United States gov- 

 ernment by its investigations established the fact 

 that the rapid corrosion of iron or steel was caused 

 by the impurities present, it remained for someone 

 to devise a method for their elimination. 



This problem has enlisted the services of some 

 of the best minds in the iron and steel industry, 

 with the result that it is now possible to procure in 

 the open market material of a very high standard. 

 Corrugated culverts have been rendered practically 

 useful by the employment of pure iron. The rigid 

 enforcement of specifications calling for the best 

 which is practically obtainable will result in lasting 

 installations of exposed iron work. 



A National Oil Engine 



Will keep your power cost down 



Think what it means to you to have at your service 

 an engine that will burn all the low grades of oils, even 

 those costing but two cents per gallon. An engine 

 that has eliminated ninety per cent of the small, deli- 

 cate and complicated parts. An engine that is ready 

 for service at a moment's notice. One that is perfect- 

 ly simple and absolutely reliable. 



That is what you get when you buy a 



NATIONAL 



Our Internal Igniter Ball (patented) gives better combustion, 

 more power and positively eliminates all danger from exploding 

 hot balls. 



Get our 1914 catalog 



The National Steam Pump Company 



UPPER SANDUSKY, OHIO 



LOW FARES 



to Northwest 

 Farm Lands 



Come to Northwest farm lands while fares are low. One way 



Spring Colonist fares daily, March 15 to April 15. 

 $25 from St. Paul, Minneapolis, Duluth, Omaha and Kansas City to 

 many western Montana points. $30 from those cities to Idaho, Wash- 

 ington, Oregon and British Columbia. 



One way Settlers' fares on certain dates $16 from St. Paul, Minneapolis and Duluth 

 to eastern Montana points. Round trip Homeseekers" fares on certain dates. Proportionately 

 low fares from your home town. 



Prosper With the Northwest 



You will find greater opportunities with your limited means on the fertile, untilled lands of the Northwest 

 than on worn-out eastern farms. Get a Free Homestead in Oregon or Montana. In three years it's ab- 

 solutely yours. Buy a logged-off, fertile farm in Idaho, Washington or Oregon at very low cost 

 Easy payments. 



E. C. LEEDY, 

 Gen! Immigr 

 Railway, St. Pa 



I. A. 



Gen! Immigration Agent, Great Northern 

 ul. Minn. 



Send me "Make-Good" book on - - - 

 and free Colonist Folder. Name of State 



Name 

 Address 



-1 



I 

 I 

 I 



Send for Facts and Fares 



&ttersfr a om f0 m'en 1 1ike GOOd " ''h"'"' 36 Pag6S> 6aCh h ^ ndsomel y illustrated. Filled with 



E. C. LEEDY 



General Immigration Agent Great Northern Railway 



St. Paul. Minn. 



When writing to advertisers please mention The Irriiration Acre 



