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An Edward Helb inclinometer with dial marked The American Combined Level and Grade Finder; image credit on full record.
Dial detail on the Edward Helb inclinometer with 1904 patent date; image credit on full record.

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Level; Helb (Edward), Combined Level & Grade Finder Inclinometer, 1904 Patent, 24 inch.

An Edward Helb, Railroad, Pennsylvania steel trimmed inclinometer level with dial marked The American Combined Level and Grade Finder and 1904 patent ... [more detail available via subscription]

p4A Item D9997928
Category:  tools & measuring devices    Origin:  Pennsylvania
Type:  drafting tools, rules & levels    Year:  1904 - 1910

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