229. Right-right turning test of picking up screws and screwing them into a board. Collection: Early 20th Century Engineering Lantern Slides Set: Aptitude Tests Date: undated Format: Image Agent: unknown
230. Pinboard test for employees before they work in a pencil factory. Collection: Early 20th Century Engineering Lantern Slides Set: Aptitude Tests Date: undated Format: Image Agent: unknown
231. Spiral inspection designed to test inspection ability Collection: Early 20th Century Engineering Lantern Slides Set: Aptitude Tests Date: undated Format: Image Agent: unknown
232. Man standing behind milling machine which drilled holes into a valve flange. Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
233. Picture of two connecting engine rods for comparison: one older and the other larger and newer. Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
234. Heald No. 81 Internal Centerless Grinding Machine Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
235. Stamping press machine for parts in an automobile factory Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
236. Men working in a factory assembly line of roofs panels for automobiles Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
237. Two men stacking parts in an automobile factory Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
238. Man standing in front of vertical milling machine used for profiling (finishing). Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
239. Wide view of factory with automated machines Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
240. Man's hand holding a caliper in from of a hobbing machine. Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
