derably larger total of horse covery in modern times, however valuable and impor- tant this may have been. As far as profits are con- power. Weare indebted to Mr. Emil 8S. Boas for our cerned, the invention of toys pays better than those of illustration and particulars. anything else. a Money has… … the use of twodiaphragms imparts to the sound ward movement of the sleeve. that quality which, as before remarked, de- The valve is under the complete control of the oper- pends upon the application of the principle of ator, for when he grasps the sleeve to force the drill resonance or of…
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-589-382.webp)
