This is from the Vintage Camera Lab website:

Control-wise, the No. 2A Brownie doesn’t have much. Located on the user’s right hand side underneath the landscape orientation viewfinder window is the shutter lever which trips the rotary shutter at a fixed speed of 1/30. Next to the portrait orientation viewfinder window on the top of the camera are two metal tabs. The wider metal tab in the middle controls the aperture (f/8, f/11, and f/16) depending on how far up it’s lifted. The smaller tab activates the “Time” shutter speed which holds the shutter open for as long as the user desires. Once an image is taken, a winding key on the right hand side advances the film to the next frame. There are two hand strap lugs on the top and a frame counter window on the back. To load or unload film, undo the two metal clips on the top and next to the winding key and then pull the winding key out to unlock the body. Once unlocked, the entire front end slides out from the body to reveal the film.

Located in the Woodlawn area of Dartmouth.