Take a look at the Quebec National Library site at

http://www.bnquebec.ca/musique_78trs/accueil.htm

This contains hundreds of 78s transcribed into real audio.

Follow the links to "index des sujet" and then to any of the categories. There isn't one specificaly for violins but the category "Danse folklorique, Musique de" contains lots of violin recordings.

There's a similar site for Old Time recordings at http://honkingduck.com/BAZ/baz_side.php

Howard Mitchell Stradivarious