Magnetic-flux-lattice anisotropy of ${\mathrm{Tl}}_2$${\mathrm{Ba}}_2$${\mathrm{Ca}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{10+\mathrm{\delta }}$ by ${}_{}{}^{205}{}_{}{}^{}\mathrm{Tl}$ nuclear magnetic resonance

${}_{}{}^{205}{}_{}{}^{}\mathrm{Tl}$ nuclear-magnetic-resonance spectra of aligned powders of ${\mathrm{Tl}}_2$${\mathrm{Ba}}_2$${\mathrm{Ca}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{10+\mathrm{\delta }}$ were measured at 5 K as a function of the angle between the magnetic field and the alignment axis. Using the alignment distribution obtained from an analysis of normal-state spectra, spectra for perfectly aligned crystals were extracted. The angular dependence of the resonance-frequency shift was found to be consistent with the anisotropic London theory, and the average penetration depth was found to be 7040 Å. A small reduction of the spin shift at 5 K was observed.