The Heurtley magnifier was a way of detecting weak telegraph signals in the pre-electronic era, and is based on the Wheatstone bridge developed by Cha...

The Heurtley magnifier was a way of detecting weak telegraph signals in the pre-electronic era, and is based on the Wheatstone bridge developed by Cha...
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Image Number:  1895-12092Rights ManagedCredit Line:SuperStock / SM/SSPL/Science and SocietyCollection: Science and Society Contributor: SM/SSPL Model Release:NoProperty Release:NoResolution:3504×2753
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