of themotion, we made use of Lord Kelvins double suspension mirrormethod, i. e., a very light mirror F was attached to the end of theglass arm, as shown in Fig. 6. One end of a loop of cocoon fiberwas fastened to the end of the arm at G^ and the other end to afixed point //, the mirror being… … Fig. 6.—End View of Apparatus for Measuring Changes in Length. The mirror and the threads were almost completely surroundedby a brass vessel T with a glass front for observing the deflectionsof the mirror. The top of the vessel was covered with a piece ofcardboard containing a narrow slit just wide…
Magnetism · Magnetic properties and materials
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