49. Universal multiple drill machine, drilling both horizontal and vertical Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
50. Motorized turret lathe Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: Pawtucket, Rhode Island Date: undated Format: Image Agent: unknown
51. Drawings of three heads linking shape of head to various personality characteristics. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
52. Eight pictures of one man in suit and tie making various small gestures. Includes head whereas image #391 does not. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
53. Drawings of the faces of Michelangelo and Alexander von Humboldt and a 3rd person. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
54. Drawings of three faces side profile. Labelled convex, plane, and concave. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
55. Drawings of two men, labelled angle-line and dot-line, with a graph mapping to personality traits. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
56. Drawings of multiple faces labeled convex to concave, mapped to personality traits. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
57. Drawing of man illustrating "will regions" Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
58. Drawings of two faces with labels on chin and jaw. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
59. Typical losses in an oil-fired marine boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
60. Refractory furnace linings compared between the navy and merchant installations Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
