1876 Patent

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

Can you tell what this 1876 patent is for?
 
Photo Credit: Wikipedia

 

On this day in 1876, Alexander Graham Bell received history's first official patent for the telephone, taking the first step on the long road toward the fulfillment of Bell's lifelong dream that, one day, people of the future would be able to send each other pictures of their junk. (Correction: An earlier version of this item suggested Bell had used the word "telephone" to describe his device in his patent. Instead his patent was for "Improvements In Telegraphy.")