The 4175 model number was used for two distinctly different offerings in the K&E catalogs. From 1901 to 1915 the 4175 was an ivory sector. From 1936 to 1939 the model number was used for the Kurtz Psychrometric Slide Rule. Each type of rule will be described separately below:
The 4175 & 4176 Family of Slide Rules (Boxwood and Ivory Sectors)
(1881-1915)
Description:
Catalog page from the 1881 catalog
Catalog page from the 1899 catalog
Catalog page from the 1901 catalog
K&E offered Sectors at various times in their history.
The following model numbers make up the Sector family of slide rules:
- 480 ------- 6" Ivory Sector
- 481 ------- 6" Boxwood Sector
- 1749-7 --- 12" Boxwood Sector
- 1749-8 --- 12" Ivory Sector
- 4175 ------ 12" Boxwood Sector
- 4176 ------ 12" Ivory Sector
History:
The 480 (Ivory) and 481 (Boxwood) Sectors first showed in 1881 and 1883 described as 6" models. In 1897 and 1899 the 12" 1749-7 (Boxwood) and 1749-8 (Ivory) models were shown. In 1901 the model numbers were converted to 4175 (Boxwood) and 4176 (Ivory). The sectors last appeared in the 1915 catalog.
- 1881 -- The 480 and 481 first appeared in the 1881 catalog.
- 1883 -- The 480 and 481 last appeared in the 1883 catalog.
- 1897 -- The 1749-7 and 1749-8 were introduced.
- 1901 -- The 1794-7 and 1749-8 model numbers were converted to 4175 and 4176.
- 1913b - The 4175 and 4176 did not appear in the soft bound catalog of 1913.
- 1915 -- The 4175 and 4176 last appeared in the 1915 catalog.
Links to catalog pages for the 4175 and 4176 family of slide rules:
The 4175 Kurtz Psychrometic Slide Rule
(1936-1939)
Description:
Catalog page from the 1937 catalog
The Kurtz Psychrometric Slide Rule is 10" simplex slide rule with celluloid facings. The scales are designed for Air Conditioning calculations.
The 4175 model number was used previously for a Boxwood Sector in the 1915 and earlier catalogs.
History:
The 4175 Kurtz Psychrometric Slide Rule was first shown in the 1936 catalog. The last mention of the 4175 Kurtz Psychrometric Slide Rule is in the 1939 slide rule only catalog.
- 1936 -- The 4175 Kurtz Psychrometric Slide Rule was first introduced.
- 1939 -- The 4175 Kurtz Psychrometric Slide Rule was last shown.
Links to catalog pages for the 4175 Kurtz Psychrometric Slide Rule:
Scans: Link to scans of 4175 Kurtz Psychrometric Slide Rule