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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Circular and Spiral Slide Rules
Schacht & Westerich / RECHENUHR - System Thomas
Schacht & Westerich
Germany
Metal
1900s
Ø 8.4 cm
Machining
Notes:
The possible maker is better known as a retailer. Consisting of four stacked brass discs with: (i) the outer and inner discs fixed and (ii) the second and third discs free to rotate. Accompanying case is possibly homemade and not original.
Image 1
Image 2
Image 3
Image 4
Image 5
Image 6
Image 7
Image 8
Image 9
