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.