SKILL AND REFLECTION NEEDED IN REPAIRING INJECTORS.
Injectors can be kept in good order with less work than is needed to keep a pump going, but the highest kind of mechanical skill is required for the injector when repairs must be done. Almost any kind of machinist can fit a new chamber or plunger into a pump. Many men who will do this job satisfactorily will get badly left when they try to put a defective injector in order. To do such work, thoughtful reflection is called for, besides the hand that can do accurate fitting. A workman who may be good on guides or cross-heads or links, takes an injector apart that will not work, and can perceive nothing wrong with it, because he has not got the philosophy of the thing through his head; and he must have that before he can have insight into the probable cause of derangement.