Construction Level

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Indicator that establishes the horizontal when a bubble is centered in a tube of liquid

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Source

Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)

Downloads

TIFF (full resolution)

2400×812, 560.6 KiB

Large GIF

1024×346, 93.5 KiB

Medium GIF

640×216, 48.5 KiB

Small GIF

320×108, 16.5 KiB