313. Diagram showing effect of boiler pressure upon boiler efficiency Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
314. 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
315. Torpedo tubes from the destroyers Pensacola class, Mahan class, Sampson class, Benham class, and North Carolina class Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
316. 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
317. Photograph of the interior of a battleship showing 2 rows of torpedo tubes Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
318. Gauge showing steam vs water in boiler Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
319. Cross section of drum internals on torpedo ship Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
320. Diagram of drum internal showing water level, baffle, and steam Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
321. How 34,700,000 jobs are divided Collection: Early 20th Century Engineering Lantern Slides Set: Personnel Location: United States (nation) Date: undated Format: Image Publisher: Business Week
322. American labor unions, who is organized and who is not Collection: Early 20th Century Engineering Lantern Slides Set: Personnel Location: United States (nation) Date: undated Format: Image Publisher: unknown
323. Table comparing percent of employees in two departments, Arts and Engineering and if they were in their 1st or 4th year Collection: Early 20th Century Engineering Lantern Slides Set: Line & Staff Location: unknown Date: undated Format: Image Publisher: unknown
324. Employment status form Collection: Early 20th Century Engineering Lantern Slides Set: Line & Staff Location: unknown Date: undated Format: Image Publisher: unknown
