Not a Coal Mining lamp. A flame safety lamp, used for the inspection of sewers, drains and ships holds etc.. Made by :- J.H. Naylor Limited of Wigan with aluminium bonnet, brass cage, 5 brass pillars and brass oil vessel. , , , , The lamp has two internal gauzes, brass rretaining ring, glass and a form of bifold burner. Inscription Naylor, Wigan 1805 and stamped 175. Made in about 1950 - 1960. It was collected to demonstrate other applications of safety lamps. It is in good condition.