[en] Model stellar atmospheres have been constructed to investigate the effects of the continuous opacity of CI, NI and OI on the Balmer jump of late-B horizontal branch stars. The large opacity of CI and NI in the ultraviolet raises the Balmer continuum through back warming without changing the Paschen continuum, while OI has little effect. The models provide an explanation for the variations in the Balmer jump which have been observed from star to star by Oke near 12,500 ⁰K on the horizontal branch of the globular cluster M92. It is concluded that some stars in M92 appear to have an atmospheric C and/or N content between one hundred and one thousand times the cluster average. The same effect of the opacities of CI and NI may also explain Newell's gap NI in the [(U-B)-(B-V)]-diagram for blue stars in the galactic halo. (Auth.)