Essential reference for engineers and technicians: clear, practical units and formulae for electrical work.
This edition presents fundamental and derived electrical units, including the absolute system and the British Association (B.A.) conventions. It compiles tables and formulae that telegraph inspectors and operators can apply in real-world work, from resistance and current to capacity and electro-motive force. The material blends historical context with practical conversions and measurements, making it a time-tested resource.
The book addresses how different unit systems relate to each other, explains how to read and use key tables, and shows how to apply formulas in everyday telegraph and electrical tasks. It emphasizes both theoretical foundations and hands-on calculations you’re likely to encounter in the field.
- Definitions and relationships for resistance, current, voltage, charge, and capacity
- Units and conversions across multiple systems, including Siemens’ mercury unit and other historical standards
- Practical tables for wire resistance, cable capacity, and thermal effects
- Formulas for electromotive force, work, and electrical power in telegraph contexts
Ideal for readers of technical reference material, students studying electrical engineering, and professionals who work with telegraph systems or early electrical measurement.