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- Thomson-Houston Current Indicator, circa 1889 -

- circa 1889
- Collections - Artifact
Thomson-Houston Current Indicator, circa 1889
- Thomson-Houston Current Indicator, 1889-1892 -

- 1889-1892
- Collections - Artifact
Thomson-Houston Current Indicator, 1889-1892
- Westinghouse Type A Synchroscope, 1910-1920 -

- 1910-1920
- Collections - Artifact
Westinghouse Type A Synchroscope, 1910-1920
- Edison General Electric Comparative Indicator, circa 1890 -

- circa 1890
- Collections - Artifact
Edison General Electric Comparative Indicator, circa 1890
- Edison Lamp Company Indicator, 1886-1889 -

- 1886-1889
- Collections - Artifact
Edison Lamp Company Indicator, 1886-1889
- Steam Engine Indicator -

- Collections - Artifact
Steam Engine Indicator
- James L. Robertson & Sons Indicator, circa 1900 -

- circa 1900
- Collections - Artifact
James L. Robertson & Sons Indicator, circa 1900
- Edison General Electric Company Indicator, 1889-1892 -

- 1889-1892
- Collections - Artifact
Edison General Electric Company Indicator, 1889-1892
- Federal Products Corporation Model H Dial Indicator, circa 1933 - Dial indicators provide accurate measurements of parts used in a number of manufacturing processes. The large numbers on the indicator's face make small, imperceptible dimensions visible. Operators compare these measurements against a standard and make corrections if any deviation is found. The Federal Products Corporation made a variety of precise measuring devices in the 20th century.

- circa 1933
- Collections - Artifact
Federal Products Corporation Model H Dial Indicator, circa 1933
Dial indicators provide accurate measurements of parts used in a number of manufacturing processes. The large numbers on the indicator's face make small, imperceptible dimensions visible. Operators compare these measurements against a standard and make corrections if any deviation is found. The Federal Products Corporation made a variety of precise measuring devices in the 20th century.
- Federal Products Corporation Model 28A Dial Indicator, circa 1928 - Dial indicators provide accurate measurements of parts used in a number of manufacturing processes. The large numbers on the indicator's face make small, imperceptible dimensions visible. Operators compare these measurements against a standard and make corrections if any deviation is found. The Federal Products Corporation made a variety of precise measuring devices in the 20th century.

- circa 1928
- Collections - Artifact
Federal Products Corporation Model 28A Dial Indicator, circa 1928
Dial indicators provide accurate measurements of parts used in a number of manufacturing processes. The large numbers on the indicator's face make small, imperceptible dimensions visible. Operators compare these measurements against a standard and make corrections if any deviation is found. The Federal Products Corporation made a variety of precise measuring devices in the 20th century.