Wright, Mark R., 1854- · London : Longmans · leaf 248
ssolve as much shellac as possible in methylated alcohol ; allowthe mixture to stand for 24 hours ; pour off; add to solution as much againof alcohol; add lampblack. Paint cardboard with this. if) A convex and a concave spectacle-glass will answer ; insert them incork or cardboard frames fixed on… … Fig. 241. hole in front; the crystalline lens is represented by a hand convex lens L,placed behind the cornea (see fig. 242, and compare fig. 112). Fill boxwith water, place in front of cornea a lighted candle, and obtain image on
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-444-215.webp)
