from The Century Dictionary.
- noun A small lantern with a reflector, designed to be hung upon the dash-board of a carriage.
Sorry, no etymologies found.
The dash-lamp threw a weird greenish glow on the driver's face.
Ponies were saddled, packs lashed on, after which the party started away, the guide leading, carrying a kerosene dash-lamp to assist her in reading blazes on trees and avoiding obstructions, for the lamp had a reflector that threw a fairly strong bar of light.