EditorialThe press gallery during the impeachment trial of President Donald Trump in Washington on Tuesday, Jan. 21, 2020. (Art Lien/The New York Times)
EditorialThe oldest form of the magnometer, Magnetometer with magnetic bar on the left and telescope on the right, Fig. 402, p. 409, 1899, E[rnst] Gerland; F. Traum?ller: Geschichte der physikalischen Experimentierkunst. Leipzig: Engelmann, 1899.
EditorialMagnetometer from Gauss, Magnetometer in which the mirror is fixed to a rod, Fig. 403, p. 409, 1899, E[rnst] Gerland; F. Traum?ller: Geschichte der physikalischen Experimentierkunst. Leipzig: Engelmann, 1899.