Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 411
suspended in the tube bydelicate silken fibre. On the back of the mirrorcemented a very small magnet. Around the tulwhich holds the mirror and lens is a hollow cylidrical bobbin of brass, on which is wound a gromany times, a fine copper wire. This wire is <insulated, that is, it is covered with…
Children's literature
Internet Archive · UNC Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from St. Nicholas [serial], 1873, leaf 411](https://img.insideoutlibrary.com/img/1024/ia-stnicholasserial01dodg-411-246.webp)
