Telegraph Block Instrument
This image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseTelegraph block instrument
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument: tombstone wood-cased single-needle electrical flow-meter.
