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.