Set 518

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3019. Sent in by a visitor who would like to find the purpose of this device, next to the scale are two glass tubes, text on it reads "James Howden & Co. Limited, Engineers, Glasgow":

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3020.

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3021. Approximately 4-1/2" long:




























3022. 18" diameter:

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3023.








































3024. Around 16" long, take a look at Neatorama for more guesses and a chance to win a T-shirt.

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Answers:



3019. This is a manometer, it uses a column of liquid that will rise or fall until its weight is in equilibrium with the pressure differential between the two ends of the tube. It was most likely used for checking the flow of heating air through flues.

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The tubes are connected by the openings in the bottom part:

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3020. A planimeter, it can be used to determine the area of a two-dimensional shape:

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3021. These are broken key extractors, for use by locksmiths to remove keys that are broken off in locks:




























3022. This is a shelf that can be mounted on a stove pipe, it was made to be used as a drying rack or for keeping food warm:

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3023. This Stevens cab tire wrench twister was used on the wire inside of a solid rubber tire that was typically found on bicycles in the late 1800s, the ends of the wire were looped around each other and then twisted so they wouldn’t come apart.











































3024. This is a rounding plane that is dated 1801, it was used for preparing the ends of wooden axles:

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