Excerpt from Vulcanizing as Applied to Dentistry
Vulcanizers, if made by manufacturers of experience, may be depended upon to be strong enough to withstand a pressure three or four times as great as that incident to the vulcanizing process. No house, having any regard for its reputation, can afford to offer one for sale unless it is of undoubted strength. When their manufacture is undertaken by those having no experience, the result is very apt to be unsatisfactory, both to the maker and purchaser. Some of the patterns in the market, though apparently strong, will yield gradually to the strains they are subjected to, and in a short time the packing joint will get out of true, and it will then be difficult to keep them steam-tight. Dentists are therefore cautioned against purchasing vulcanizers of new and untried designs, unless the maker will give a full and strong warrantee that they will not get out of true by use. When the cover of the vulcanizer is attached to the pot by a screw thread, as in the well-known Whitney pattern, there is no danger of this trouble. The caution applies more especially to those in which the cover is held by a clamping device, which only has a hold upon the edge of the pot at intervals.
A good rule is not to buy any make unless it is known to be reliable, either by personal experience, or by the testimony of some one who has used one of the kind long enough to develope its weak points, if it has any.
A vulcanizer may be of the proper design, and still be unsatisfactory to the user if it is not well fitted. This is a point in which inexperienced makers are apt to fail, and constitutes a good reason for not giving their goods a trial.
It is now proposed to touch upon a few points in the matter of the proper care of vulcanizers, and to show how and when they become unsafe for use.
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