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Collection of pages from K&E catalogs for the 4140 and 4141

Hudson's Horsepower Computing Scale

Description:

Page from the 1910 catalog

The Hudson's Horsepower Computing Scale is 4 1/2" long. It has two slides. Its purpose is in various calculations for steam engines. It was offered in a cardboard and boxwood versions.

Model numbers in the group:

• 4140 --- 4 1/2" Hudson's Horsepower Computing Scale on cardboard.
• 4141 --- 4 1/2" Hudson's Horsepower Computing Scale on boxwood.

History:

The 4140 and 4141 were first shown in the 1901 catalog. The last mention of the 4140 and 4141 is in the 1916 catalog. The following is a brief history of the Hudson's Horsepower Computing Scale as is told in the K&E catalogs that are available at this time. Exact timing is not possible because of the time between catalogs.

• 1901 -- The Hudson's Horsepower Computing Scale was first introduced.
• 1916 -- The 4140 and 4141 were last shown in the 1916 slide rule only catalog.

Links to catalog pages for the 4140 and 4141 family of slide rules:

• 1901 1903 1906 1909 1911 1913a 1913b 1915 1916

Scans: Link to scans of 4141s