Apparatus Drawings Project. Report Number 29. Accessory Apparatus for Large Electromagnet: Developed for use at the California Institute of Technology

The four devices described are designed to fit the large electromagnet, described earlier in this series, thus greatly enhancing its usefulness. (1) A magnetic force on a current-carrying conductor apparatus is intended for undergraduate laboratory investigations. A current of 50 amp in a magnetic field of $0.8 weber/m2$ will produce a force on the conductor of nearly 3.2 newtons. The conductor current is normally obtained from lead storage cells. (2) An eddy current pendulum, 1 meter long, is used for lecture demonstrations. (3) Truncated square pyramidal pole faces provide the intense magnetic fields (about $1.3 weber/m2$⁠) required for a practical sophomore laboratory experiment on the Zeeman splitting of spectral lines. (4) The last device described is a single pole face specially tapered to produce a highly inhomogeneous magnetic field for experiments and demonstrations dealing with para- and dia-magnetism. Detailed information regarding construction of the apparatus is given.