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.