| Sub-Type | Barometers |
|---|---|
| Type | Engineering/ Surveying |
| Country of Origin | United Kingdom |
Check the listing for details. Vintage De Laval Separator Pocket Sliderule Dairy Industry. Condition: Used, Made in United Kingdom. Listed at 27.19 USD. De Laval separator slide rule is a vintage, specialized pocket calculator, often categorized under engineering or scientific collectibles. Used by dairymen, it was likely designed to calculate separation efficiency, fat content, or optimal machine settings for De Laval cream separators. These tools helped manage centrifugal separation, which revolutionized dairy farming in the late 19th/early 20th century
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