Another name for a Gas Harp is a Hall Hoop.
These Hoops make great hall fixtures as well
as great fixtures for small spaces. Hall hoops
were used over Wash Stands with pitchers and bowls
before modern plumbing was installed. A gas pipe
would be on the ceiling in the corner or against
the wall in a bedroom and Hoops would be for over
the wash stand.
When people installed modern plumbing but were still
lighting with gas there would be a hall hoop in the
bathroom. This is a great light for small rooms as
long as the ceiling is high. You usually need 24 inches
of clearance to do a hall hoop. If you want the bottom
to be about 6 foot nine from the floor then your ceiling
needs to be 8 foot nine inches to do a Gas Harp.