Adwel Model W504, S/N 799113
Functions: Add, subtract, sub-total, total; manual operation
Digits: 7 keyboard, 8 printer
Dimensions: 8-1/2"W x 14-1/2"D x 6-1/2"H
Weight: 15 pounds approx
Manufactured: Bergen, Norway, 1960s.
The "Adwel" Model W504 is an attractive full-keyboard printing calculator or "add-list" machine. Although this particular model is one of the most basic office calculators, it still manages to contain well over one thousand manufactured parts, and its mechanism is far from straightforward.
These notes contain a series of pages describing the essential features of its construction, followed by a detailed description of its principles of operation and some of its peculiarities.