Despite the odd title, there is a lot of useful information here for those of you who want to design and build your own transformers, possible to non standard outputs. The major part of this booklet is the 1938 article, which really does contain enough info, facts and formulae to satisfy most builders. The shorter 1922 article is on building ignition coils and packs a lot into its 8 pages. 48 pages in all, with drawings, graphs and the like. Softcover. Lindsay Publications