  A decade after the discovery of TeV gamma-rays from the blazar Mrk 421 (Punch
et al. 1992), the list of TeV blazars has increased to five BL Lac objects: Mrk
421 (Punch et al. 1992; Petry et al. 1996; Piron et al. 2001), Mrk 501 (Quinn
et al. 1996; Aharonian et al. 1999; Djannati-Atai et al. 1999), 1ES2344+514
(Catanese et al. 1998), H1426+428 (Horan et al. 2000, 2002; Aharonian et al.
2002; Djannati-Atai et al. 2002) and 1ES1959+650 (Nishiyama et al. 1999;
Konopelko et al. 2002; Holder et al. 2002). In this paper we report results
from recent observations of Mrk 421, H1426+428 and 1ES1959+650 using the
Whipple Observatory 10 m telescope.
