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.