
We have expended several dollars for file carriers, but have not used one for two or three years, for the above reasons.

To obviate the defects above alluded to If thin files are to be used in it, whose thickness is less than the diameter of the holes, a back may be fitted as directed in regard to the files, the sides of which are cleft, and the separating files fastened in this with shellac.

As many dentists are not located so as to have access to a file manufacturer, it may not be improper to add, in this connection, some directions for converting common files into such as are proper for the dentist's use.

Not being able at all times to obtain files of a desirable shape, we have ourself frequently worked over such as we could obtain.

Our method is as follows: We select such files from a hardware store, as can be most easily re-modelled and anneal them by putting them into a piece of gun-barrel, filling up the vacant space with powdered charcoal, and then closing the open end with an iron stopper. We then put this gun-barrel containing the files, into a forge or some convenient place, and build upon it a fire of hard wood. This we let burn entirely down, and cool before we disturb it; after which time the files will be found to be as soft as steel is susceptible of being made, while they are hardly discolored by the heat. This is a very convenient and economical way of preparing files, and will often enable the. operator to secure particular shapes, which he could not otherwise readily obtain. The same process of annealing and hardening will apply to any other instrument where it is desirable not to oxydise, or scale it.?Syracuse Ed.

{'paper_id': '59610932', 'title': 'File Carriers', 's2_url': 'https://api.semanticscholar.org/CorpusID:59610932', 'source': 'S2ORC'}