A new type of high-temperature spectrometer for operation in the millimeter- and submillimeter-wave regions has been constructed and used for measurements of numerous rotational transitions of AgCl at 750°C. Significant improvement in sensitivity over other high-temperature spectrometers operating in the submillimeter region has been achieved. With it, rotational lines of AgCl up to a frequency of 366 858.51 Mc/sec ($\lambda =0.8\mathrm{}$ mm) have been measured with high precision. The molecular constants obtained are. For ${\mathrm{Ag}}^{107}$${\mathrm{Cl}}^{35}$, $B_e=3686.9639\mathrm{}$ Mc/sec, ${\alpha }_e=17.8498\mathrm{}$ Mc/sec, ${\gamma }_e=0.01883\mathrm{}$ Mc/sec, $D_e=1.8903\mathrm{}$ kc/sec, ${\omega }_e=343.52\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{x}_e=1.169\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $r_e=2.28078\mathrm{}$ Å; for ${\mathrm{Ag}}^{109}$${\mathrm{Cl}}^{35}$, $B_e=3670.2777\mathrm{}$ Mc/sec, ${\alpha }_e=17.7284\mathrm{}$ Mc/sec, ${\gamma }_e=0.01859\mathrm{}$ Mc/sec, $D_e=1.8739\mathrm{}$ kc/sec, ${\omega }_e=342.68\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{x}_e=1.163\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $r_e=2.280779\mathrm{}$ Å; for ${\mathrm{Ag}}^{107}$${\mathrm{Cl}}^{37}$, $B_e=3536.8734\mathrm{}$, ${\alpha }_e=16.7705\mathrm{}$ Mc/sec, ${\gamma }_e=0.01708\mathrm{}$ Mc/sec, $D_e=1.7383\mathrm{}$ kc/sec, ${\omega }_e=336.58\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{x}_e=1.118\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $r_e=2.280781\mathrm{}$ Å; for ${\mathrm{Ag}}^{109}$${\mathrm{Cl}}^{37}$, $B_e=3520.1846\mathrm{}$ Mc/sec, ${\alpha }_e=16.6520\mathrm{}$ Mc/sec, ${\gamma }_e=0.01710\mathrm{}$ Mc/sec, $D_e=1.7192\mathrm{}$ kc/sec, ${\omega }_e=336.04\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{x}_e=1.121\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $r_e=2.280782\mathrm{}$.

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