blue cap

blue cap

[′blü ‚kap]
(mining engineering)
The characteristic blue halo, or tip, of the flame of a safety lamp when firedamp is present in the air.
References in classic literature ?
He stooped a little, and with his tattered blue cap pointed under the carriage.
The accursed was already under the carriage with some half-dozen particular friends, pointing out the chain with his blue cap.
The sweet scents of the summer night rose all around him, and rose, as the rain falls, impartially, on the dusty, ragged, and toil-worn group at the fountain not far away; to whom the mender of roads, with the aid of the blue cap without which he was nothing, still enlarged upon his man like a spectre, as long as they could bear it.
So they opened the door and entered the house, where a little light-brown donkey, dressed in a blue apron and a blue cap, was engaged in dusting the furniture with a blue cloth.
A blue cap with a patent leather peak set well at the back of his yellow bush of hair gave him the aspect of a Norwegian sailor bored with the world after a thundering spree.
There were five corps, each with a color of its own; there were white caps, blue caps, and red, yellow, and green ones.
He was clean shaven and wore a dark blue cap with a peak and a dark top and bottoms.
pants navy blue sweater, and navy blue cap with hospital monogram.
All security guards would wear sky blue colour shirt, navy blue pants navy blue sweater, and navy blue cap with hospital monogram.
At the time Trump tweeted a photograph in which he was wearing a white baseball cap and polo shirt, high-fiveing Abe who was dressed in white pants and a navy blue cap.
1 The children's comic Eagle was launched 2 Princess Anne was born 3 George Bernard Shaw died 4 British troops were sent to fight in the Korean War impossipuzzles A blue cap and a white cap costs twice as much as a red cap and a green cap, but only a pound more than a blue cap and a red cap.
One was described by the police as wearing a yellow shirt and blue cap, 5'2 to 5'4 in height, of medium build and dark complexioned.