This section is from the book "The Gardener V1", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
Although we feel that the source of information to which you refer is ample, we gladly accede to your request. Prune your Vines immediately they have cast their leaves. As a rule, the spur system of pruning is the best - that is, to cut back to one or at most two eyes from the main stem. There are few exceptions to which this rule may not be applied in the case of properly-ripened Vines. "We have not excepted even the Barbarossa, to which your enclosed quotation applies. If well ripened, we have found it fruit freely by close pruning. But we are under the impression that this Grape is more influenced as to its fruitfulness by soils than almost any other Vine - so much so, that we have at times thought that there are varieties of it just as there are varieties of Muscats and Hamburgs. The long-spur system - that is, the leaving three or four eyes of young wood - may produce you larger-formed bunches than closer pruning, but they will not be so compact and useful. As a rule, long loose bunches do not make such large berries, have generally longer and more slender stalks, and are more subject to shank and shrivel.
Within two miles of where we write are a set of Vines, including Muscats, Lady Downes, Muscat Hamburgs, Frontignacs, etc, that have yearly been so closely pruned that it would be most difficult to discover even the vestige of an eye left, and these Vines have produced and perfected magnificent bunches of the sorts named. If Vines are not properly ripened, of course the chances of a crop are increased by leaving two or three eyes instead of one - and that is all we feel disposed to say for so pruning; and in time Vines become exceedingly unsightly with long "cow-horn" snags. The loose bark is best removed from Vines, because the crevices afford shelter for insects; but avoid scraping to the quick or tender live bark. Your query was too late to be replied to in January.