I've looked at my small collection of "old" textbooks, all rescued from
the trash cans behind LeConte Hall in Berkeley in the 1950's (Yes, I
was a dumpster diver):
=46ranklin & MacNutt "The Elements of E & M" (1908) (USA) I =3D current
Kohlrausch "Praktischen Phyzik" (1884) (German) i =3D Stromst=E4rke
J.B.Murdock (U.S.Navy) "Notes on E & M" (1884) (USA) C =3D current
=46oster & Porter "E & M"* (1903) (USA) C =3D current
Silvanus Thompson "Elementary Lessons in E & M" (1889) (England) C =3D curre=
nt
=46ranklin "Electric Waves" (1909) (USA) I =3D Current
Ames "Theory of Physics"** (1897) (USA) i =3D current
Daniell "Principles of Physics"*** (1894) (Scotland) I & i =3D current
Drew "A Sophomore Course in Physical Measurements" (1898) (USA) c =3D curren=
t
Everett "C.G.S. System of Units"**** (1891) (Ireland) C =3D current
*This book appears to be "founded on" Joubert "Trait=E9 =E9l=E9mentaire
d'=E9lectricit=E9" (presumably French).
**Ames specifically identifies "i" with the intensity of the current.
***Daniell specifically identifies "I" with the Intensity of the current.
****Everett uses "i" for "intensity", meaning electric field intensity.
I have more books, many without any electricity. I cured my computer
monitor of an alarming tendency to have high voltage hiccups followed
by loss of horizontal sweep on the weekend. Apple tried valiantly to
prevent me from getting inside their box, but I succeeded anyway. I'm
feeling quite smug today.