Lamps are primitive in form and function. They were popular
in the 1600's to 1700's but were still widely used into the
19th century by poor households.
A simple Crusie lamp
is basically a formed metal bowl to hold fuel with an indentation
or channel to hold a wick. This was a durable improvement over
the clay pottery lamps of ancient times.
in lighting design can be seen with the Crusie as later styles
are found with multiple wick channels in an effort to produce
more light. Also, because unburned oil would drip from the wick
onto the ground in waste, another bowl was placed under the
Crusie to catch this oil. These lamps are called Double Crusies
as well as commonly named Phoebe Lamps.