In 1806 Bryan published, also by subscription, and in quarto, Lectures on Natural Philosophy (thirteen lectures on hydrostatics, optics, pneumatics, and acoustics), with a portrait of the author, engraved by Heath, after a painting by T. Kearsley; and there is a notice in it that "Mrs. Bryan educates young ladies at Blackheath." In 1815 Bryan produced an Astronomical and Geographical Class Book for Schools, a thin octavo. The lectures had been previously available only to noblemen, educators, and booksellers. The text was supplemented with diagrams as well as portions for exercises. She described the mechanics of the air rifle, the hot air balloon, the diving bell, as well as Newton, Galileo, and Benjamin Franklin, including the latter's experiments with lightning.
