[CW] Origin of 'ES'?

[George, W5YR]

As I recall, ES is a character in landline Morse that seems appropriate.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437


Will White wrote:
> 
> Does anyone know the origin of using 'ES' for 'and' in CW? Obviously, it is
> shorter to send, but why not the Spanish 'Y' or French 'ET'? It *looks* to me as
> though it is derived from another language, rather than a contraction or
> abbreviation of English, like GUD for good or ABT for about, but who knows. ANy
> ideas?
>