Answer: when it’s between rooms instead of between a room and the outdoors. You’re not expected to look through a Borrowed Light Window. In fact they are usually positioned high on the wall. Their purpose is to bring light from a room that has outside windows into an otherwise dark interior space like a closet or a hallway.
When the 1832 New York City rowhouse now known as the Merchant’s House Museum was opened to the public as an historic house museum in the 1930s, some minor modifications had to be made to provide for public amenities. Recently, research was undertaken to find out just what those modifications consisted of. Much to everyone’s surprise, a Borrowed Light Window was discovered under the plaster of the original kitchen.
That window has now been restored so that visitors can be reminded of what was certainly one of the greatest domestic concerns before the introduction of gaslight and particularly electricity.
It’s hard for us to imagine just how demanding the task or how different life was without the instantaneous availability of artificial light. To supplement the natural light of the sun during dark days and of course always at night, it was necessary to have a fire of some kind, and all fires tend to be accompanied by smoke. Candles smoked and dripped; oil lamps smoked and smelled and wicks had to be trimmed, candle wax scraped off of holders and glass shades cleaned every day. Oil spills were common and were a mess! Kerosene came along in 1859, but though the light burned brighter, other drawbacks persisted. Once the sun dropped below the horizon, most of the house was enveloped in total darkness. Typically there was a pool of light—what we would consider very dim light— where the family sat together around a single light source.
Borrowed Light Windows helped some during the day. They were a common feature of houses built before the introduction of electric lights.
On a recent weekend trip to Philadelphia we stayed in a bread and breakfast located in a colonial home built in 1769. And what do you know? In the bedroom we discovered—a borrowed light window!
P.S. Since posting, I’ve received a photo of a Borrowed Light Window in the Steinway Mansion in Astoria, Queens from Kevin. A 19th-century Italianate villa, the mansion is privately owned, but Friends of the Steinway Mansion have mounted a campaign to purchase the house and open it to the public. https://www.facebook.com/steinwaymansion
Does anybody else have a picture of a Borrowed Light Window?