1906 skyscraper derrick crane. Shor...

1906 skyscraper derrick crane. Short, stout mast only 10–15 blocks tall. A very long angled boom, 30–40 blocks long, pivots near the bottom of the mast and rises outward. The boom is the dominant feature. Multiple guy cables run from the top of the mast to the boom. Small steam-powered machinery at the base. Mounted to the skyscraper's steel frame. NO tall tower, NO horizontal jib, NO counter-jib, NO modern tower crane.