Locke Adder
Addiergerät (Zahlenschieber)
1905
Locke Adder
Adder (number slider) (ca. 1905)
This rare American tin-bar adder with finger adjustment was designed and manufactured by Clarence E. Locke, Mfg. Co, Kensett, Iowa, USA. Four cartouches in Art Nouveau decoration are stamped on the copper frame. In this form, the Locke Adder was hardly common in Europe, but it is related to the "universal calculator" Omega by Justin Bamberger. Both devices were probably more decorative prestige objects for the desk than useful calculating aids. The operator must perform the tens transfer mentally and manually.
- Inventory number:
- FDM9033
- Inventor:
- Locke, Clarence Elmer
- Year of invention:
- 1900
- Manufacturer:
- C. E. Locke Mfg.Co. (Kensett, Iowa)
- Year of manufacture:
- 1905
- Main category:
- Einfaches Rechenhilfsmittel
- Subcategories:
- Zahlenschieber
- Capacity:
- 9 (EW) x 9 (RW)
- Dimensions (H x B x T):
- 1 x 27 x 10 cm
- Weight:
- 270 grams
- Production period:
- 1900 - 1914
- Patents:
- US 689680 [1900]
- US 779088 [1904]
- Further exemplars in the collection (1):