Key Information
Reference code
K/PP107/11/1/20
Title
Resistance box, [1850-1875]
Date(s)
- [1850 - 1875] (Creation)
Level of description
Item
Extent
1 item
Scope and content
Resistance box for measuring resistance in length of telegraph wire at intervals of 50 miles. Consists of a wooden box with brass plates and knobs.