K&E 4053 Family of Slide Rules

Scale set #1 (1909-1921)

Scale set #2 (1922-1972)

The K scale was moved from the bottom edge of the rule to the front and a centi-meter scale was added on the bottom edge.


	

In 1954 the construction method changed.

The profile and construction of the slide rules are significantly different. An example of this is shown in the following scans:

The scale set remained the same.


Larger frame for 20" 68 1308 from 1962 to 1967

The scale set remained the same.

10 inch / A = B CI C = D K \ 25 cm

= S L T= --- L increases to Right

33 mm wide frame

Some time between 1955 and 1959 a 5" all plastic 4053 style rule was released.

The inch and centi-meter scales are not on the edges.

US Goverment Issued Variant with Decimal Trig Scales.

The inch and centi-meter scales are not on the edges.