Description of a porthole! Is it correct, thanks to everybody for this.

I was really fed up but I couldn’t tell my mother because I knew she was also exhausted. I also knew that we couldn’t afford to have a worker to clean the house. She worked very hard around the house.
High up in the wall where the wall meets the ceiling there was a window that looked like a porthole. The glass disk of the porthole was encased in a separate frame which was hinged onto the base frame. The glass disc was swing open outside. We first couldn't figure out at first that what this thing was for, and why it was placed up there on the wall. Later on we understood that it was done to get more light enter into the kitchen when darkness is prevailed during gloomy winter days. It looked like the reel of a clear plastic record player embedded in the wall.
We had been busy with house cleaning all day. She washed and cleaned every corner of the house. Since her hand could not reach the outer side of the glass my mother was not able to clean the outer side of the porthole.
"I cannot do more than this," said my mother.