er in unison when the bellows is formed, to moisture, but has the disadvantage of softening and is the problem one has to first study. sticking in a prolonged heat, particularly when the Diagram A illustrates the method of outlining the air is very humid, as it sométimes is in the United sheet with… … The sheet is folded up, after creasing, as shown in the bellows waterproof, it is varnished ‘on the outside Fig. 3, and tightly compressed, which ‘gives the folds a with two coats of shellac varnish. When secured to willleak. Besides this, it is heavy and will break at the front and rear frames of…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-61-61.webp)
