Crowbar and Stone Small 320×229 Medium 640×458 Large 1024×733 Download Tiff Original 2400×1719 | (373.8 KB) Description "... a farmer with a crowbar, as shown, can move a rock which with his hands alone he could not stir." —Quackenbos 1859 Keywords crowbar, lever, machine, move, Rock, simple Galleries Levers Source: G. P. Quackenbos A.M. A Natural Philosophy: Embracing the Most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life (New York: D. Appleton and Company, 1859) 90
