25. Diagram showing effect of feed water boiler temperature upon boiler efficiency Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
26. Steam boiler showing water level, generator, 4 ply metal bellows, and feed water regulator valve Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
27. Gauge showing steam vs water in boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
28. Large Tube Yarrow boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: 1903 Format: Image Agent: unknown
29. Boiler Tubes from a Thornycroft Boiler, used in torpedo boats Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: Possibly photographed at Cavite Navy Yard, Philippine Islands Date: undated Format: Image Agent: unknown
30. Babock & Wilcox express double type furnace boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: unknown Date: undated Format: Image Agent: unknown
31. Thornycroft boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
32. Water-tube boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
33. Yarrow steam boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: unknown Date: undated Format: Image Agent: unknown
34. Yarrow steam boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: unknown Date: undated Format: Image
35. Yarrow steam boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: unknown Date: undated Format: Image
36. First EC-2 cargo vessel boiler by Babcock and Wilcox Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
