Anyone know about these lanterns?

[brennivs - tony drake]

It looks like these lanterns are no differnt to modern day ones .The top lid lifts of for lighting , the horn lens will slide out,and the frame can hinge out of the way so you can easily refill the oil well and trim up the wick.It also looks like the oil well is fixed to the base plate ,hence the need to have the frame on a hinge.Also with the plentiful supply of horn in Roman times, just cutting of the ends of the horn made excellent lenses and is probable why they are made round Regards Brennivs.