spring commutator
21PCC streetcar — Three PCCs on the San Francisco Municipal Railway s F line. An example of one double ended streetcar and two former SEPTA cars …
22Lacida — The Lacida (or LCD) was a rotor cipher machine designed before World War II by the Polish Cipher Bureau for wartime use by Polish higher commands. Its name derived from the initials of Gwido La nger, Maksymilian Ci ężki and Leonard Stanisław Da… …
23AC motor — An AC motor is an electric motor that is driven by an alternating current. It consists of two basic parts, an outside stationary stator having coils supplied with AC current to produce a rotating magnetic field, and an inside rotor attached to… …
24Planck constant — Planck s relation redirects here. For the law governing black body radiation, see Planck s law. Values of h Units 6.62606957(29)×10−34 J·s[1] 4.135 …
25Люси Дафф Гордон — Люси Кристина, Леди Дафф Гордон Lucy Christiana, Lady Duff Gordon …
