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. Some half-dozen other particular friends promptly hauled him out, and presented him breathless to Monsieur the Marquis.
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.
Nine-tenths of the Heidelberg students wore no badge or uniform; the other tenth wore caps of various colors, and belonged to social organizations called "corps." There were five corps, each with a color of its own; there were white caps, blue caps, and red, yellow, and green ones.
If they cannot or have become unconscious, grasp it with the orange tip pointing downward, remove the blue cap by pulling straight up, and swing and push the auto-injector firmly into the thigh until it clicks.
He was wearing a T-shirt, black pants and a blue cap.
The Encino, California native was clad in a blue cap and gown on the big day, as he earned a bachelor's degree in business administration.
Police uniforms displayed at the Central Police Office for the traffic police officers include white shirt, navy blue pants and navy blue cap.
Uniform of traffic police officer will comprise white shirt, navy blue pant and navy blue cap while that of police men pertaining to traffic would be white half sleeves shirt, navy blue pants and navy blue cap.
CNN reported that Ghosn left the detention center surrounded by guards, wearing a light blue cap, glasses and a face mask, revealing little of his face.