 But this also posed the danger of breakage in the harsh conditions of mineworking, a problem which was not resolved until the invention of safety glass.Stephenson tried several different designs in early years and later adopted Davy's gauze in preference to the tubes and it was this revised design that was used for most of the 19th century as the "Geordie" lamp.The Geordie lamp continued to be used in the north-east of England through most of the 19th century, until the introduction of electric lighting.