The subject item was produced in 1914/15 by the Telford Grier and Mackay Company in Glasgow, Scotland, this lantern was not used to provide visibility for Sailors on a ship, rather, it is meant to help other vessels identify the ship’s presence and heading in low visibility conditions hence it is marked Port and has a red filter. The lantern would have been placed along the port side of larger vessels to provided an unbroken light and would be visible in an arc from as well as at an angle from the port side of the vessel. The company was established in 1904 at 11 Fairley Street Glasgow and in 1922 moved to 10 Carrick Street. The company manufactured patented lamps for marine use, later moving into the manufacture of electrical and mechanical items. A significant marine kerosene lantern made by a company that patented this type of lantern for use by the British Navy and for merchant ships the world over. This item today is rare and sought by collectors.Ship's port side sidelight lamp with clear glass frenal lens with red filter behind, burner missing, replacement with modern electric fittingTwo makers lozenges one marked PORT the other has the maker Telford, Grier and Mackay, Glasgow, 1915 marked on main body chimney has 1914 marked . Also serial No C976 stamped on backplate.flagstaff hill, warrnambool, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, lamp ship's sidelight, ship's sidelight lamp, port lamp, marine light, navigation light, kerosene ship lamp