H&S Historical Evidence Library

Millboard & Electrical Paper

Start with what you remember, then test the history against period-specific records. This page organizes a historical research path; it does not establish what was present at a particular workplace.

Heat/electrical materialEvidence-led
Memory clue: Board-like heat shielding, heavy paper, electrical insulation or thermal barriers

Work activities worth reconstructing

  • Electrical maintenance
  • Motor/generator/transformer work
  • Circuit-breaker or switchgear work
  • Boiler/kiln/foundry maintenance

Equipment and systems that may help identify the history

Motors

Generators

Transformers

Switchgear

Circuit breakers

Boilers

Kilns

Time changes the answer

EPA historical use descriptions identify high-grade electrical paper in heavy electrical apparatus and millboard in thermal and electrical applications.

Historical sources used for this research path

These sources support the generic historical relationship described here. They do not establish a manufacturer, product or material at a particular New York workplace.

Continue from your memory

Tell us what you remember →   Historical Evidence Library →   New York Workplace Finder →