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.