Simple Machines (missing main title)

Simple Machines (missing main title) ERPI Films Man w/ shots of lever, loggers falling large conifer tree, steam shovel at construction site. CU various machines working: gears; loom, railroad driving wheels, earth moving equipment. Man shoveling sand into box. 06:11:36 Diagram of lifting pound weights to illustrate foot-pounds. Foot-pounds of work shown by illustration of man dragging box up inclined plane. 06:12:46 Inca ruins in South America w/ large stones; inclined railway; wedges driven to lift building & to split wood. CU diagram of force splitting wood w/ arrows of change of direction. 06:13:39 Wedge used by printer, knife & chisel as wedges. Screw as a rolled up inclined plane w/ bolts, wood screws shown. Screw clamp; worm gear & other gears as variation. Screw jack shown in CU as man turns by hand; w/ load man uses rod as lever. Man w/ crowbar moving rock, prying w/ lever. 06:15:55 Screw jack placed under truck. Fulcrum demonstrated. 06:16:40 CU of typewriter hand typing w/ keys attached to levers. Illustration of man lifting w/ lever. 06:17:17 Diagram of lever, fulcrum & pulley shown lifting. Water bucket pulled out of well. Steam shovel w/ winch or pulley. More diagrams showing force applied to lift weight. Lever turned into circle becomes a pulley and diagram shows how it works, and how a second pulley can double the work done w/ same force. 06:19:25 Man winching drum; large stone lifted out of truck in quarry. Cut away of automobile illustrating various machines: camshaft, gears, fans driven by pulley. 06:20:09 Road w/ cars thru suburban houses 06:20:15 Ore carrier unloaded. Man in machine shop. 06:20:22 The End Educational film, teaching, animated diagrams. 1930s; 1941;