Engineering and Technology History Wiki — EIMCO Rocker Shovel Loader
source confidence: High status: Useful updated 2026-06-25
Summary
ETHW entry on the EIMCO Rocker Shovel Loader Model 12B as an ASME landmark, covering its mechanical design, Utah origins, and international manufacturing spread.
Useful Claims
- Documents the model's origin from Utah mining practice at the North Lilly Mine in Eureka
- Credits Edwin Burt Royle and John Spence Finlay as early developers
- Notes EIMCO's Salt Lake City manufacturing and international licensing
- Confirms the ASME landmark designation and Park City location of the example unit
Verbatim
"The Rocker Shovel Loader 12B, built in 1938, provided a significant boost to underground mining productivity by emulating the movements of the human "mucker," the laborer who removed rubble, or "muck," from underground mines, particularly in and narrow mine tunnels." — ETHW landmark entry, opening
"Both men worked for the North Lilly Mine in Ureka, Utah, in the 1920s and early 1930s." — ETHW landmark entry, design history
"In 1931, Joseph Rosenblatt of EIMCO, Salt Lake City, met Royle and Findlay, and shortly thereafter, Royle joined EIMCO as a consultant and designer." — ETHW landmark entry, EIMCO manufacturing
Reliability Notes
ETHW is a professionally maintained engineering history reference. Content draws on ASME landmark documentation and is reliable for technical and historical claims. Capture gap: this ETHW entry does not state the Park City location of the landmark example unit cited on the related entity page; confirm that detail on the ASME landmark record before treating it as sourced here.