Doing it by hand

As mentioned before, primitive font selection commands like 42, 43, 44, 45, and 46 are also available to carry out the change. E.g.,

verbatim70#
will switch to the `cmsansserif' family with `normal' shape.4 This article was set in concrete roman type by simply writing 4748 following the 49 36 command.5 Of course, the 50 command also specifies a style option (`<#211#> concrete<#211#>') which sets up the internal tables for these fonts.