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Barth's cutting speed slide rule

Barth's cutting speed slide rule

Carl G. Barth
circa 1910
Barth's cutting speed slide rule

Barth's cutting speed slide rule

Carl G. Barth
circa 1910
Barth's cutting speed slide rule

Barth's cutting speed slide rule

Carl G. Barth
circa 1910
Barth's feed-speed slide rule

Barth's feed-speed slide rule

Carl G. Barth
patented 1904
Barth's feed-speed slide rule

Barth's feed-speed slide rule

Carl G. Barth
dated 1904
Barth's feed-speed slide rule

Barth's feed-speed slide rule

Carl G. Barth
circa 1910
Barth's feed-speed slide rule (in Italian)

Barth's feed-speed slide rule (in Italian)

Carl G. Barth
circa 1904
Barth's gear cutting feed slide rule

Barth's gear cutting feed slide rule

Carl G. Barth
circa 1910
Barth's gear cutting feed slide rule

Barth's gear cutting feed slide rule

Carl G. Barth
circa 1910
Barth's gear cutting feed slide rule

Barth's gear cutting feed slide rule

Carl G. Barth
circa 1910
Barth's gear slide rule

Barth's gear slide rule

Carl G. Barth
circa 1904
Barth's gear slide rule

Barth's gear slide rule

Carl G. Barth
copyright 1904
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