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The Fresno scraper is a machine pulled by horses used for constructing canals and ditches in sandy soil. The design of the Fresno scraper forms the basis of most modern earthmoving scrapers, having the ability to scrape and move a quantity of soil, and also to discharge it at a controlled depth, thus quadrupling the volume which could be handled manually.
Prior scrapers pushed the soil ahead of them, while the Fresno scraper lifted it into a C-shaped bowl where it could be dragged along with much less friction. By lifting the handle, the operator could cause the scraper to bite deeper. Once soil was gathered, the handle could be lowered to raise the blade off the ground so it could be dragged to a low spot, and dumped by raising the handle very high.
Between 1884 and 1910, thousands of Fresno scrapers were produced at the Fresno Agricultural Works, which had been formed by Porteous and used in agriculture, land leveling, road and railroad grading, and the construction industry. They played a vital role in the construction of the Panama Canal and later served the US Army in World War I.
It was one of the most important agricultural and civil engineering machines ever made. In 1991, the Fresno Scraper was designated as an International Historic Engineering Landmark by the American Society of Mechanical Engineers. It is currently displayed at the San Joaquin County Historical Society & Museum.
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