Harriet was a somewhat eccentric older woman with a taste for guns, poaching and doing things her way. She waas married to the more careful Arthur Tachyon. After Arthur's death she replaced him as a travel companion with Elizabeth Weatherby.
HARRIET: English form of HENRIETTE, and thus a feminine form of HARRY; Medieval English form of HENRY; From the Germanic name Heimirich which meant "home ruler", composed of the elements heim "home" and ric "power, ruler".
TACHYON: A tachyon (Greek: ταχύς, takhus, "swift" + English: -on "elementary particle") is a hypothetical subatomic particle that moves faster than light. In the language of special relativity, a tachyon would be a particle with space-like four-momentum and imaginary proper time. A tachyon would be constrained to the space-like portion of the energy-momentum graph. Therefore, it cannot slow down to subluminal speeds.