American School of Correspondence · Chicago, American school of correspondence · leaf 332
r both the long and the short traverse,is much less than the distance, C-D. If the long taper is wanted upon the bottom of the bobbin, thefulcrum is raised. The length of the taper can be regulated to acertain extent by raising or lowering the dagger so as to let off agreater or lesser number of… … D ^G Fig. 217. Diagram Showing Taper at Top and Bottom of Bobbin. start in the same position each time. The length of taper may then beregulated by raising or lowering the fulcrum of the builder arm andalso by letting off teeth on the ratchet gear In using the combination builder, for a filling…
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