This section is from the book "A Practical Treatise On The Joints Made And Used By Builders", by Wyvill J. Christy. Also available from Amazon: Practical treatise on the joints made and used by builders.
When a rod or bar is swelled out at the end and formed into an eye or hole for a bolt or pin, the joint so effected is an eye joint. In simple trusses bolts or small pins are commonly used for connecting the parts of composite ties, which are accordingly provided with holes or eyes at their extremities, and the same sort of connection in heavier work is noticed under Pin Joint.
Faced Joint is formed between cast or wrought iron elements or parts, such as the flanges of columns, pilasters, cylinders, tubes, etc, or between bearing, base, bed, or cap plates, flanges, etc, previous to bolting down, riveting, or bedding. It is made by levelling and smoothing the surfaces of contact by chipping and filing, or by the use of the planing machine, with the object of securing the benefits of a full and continuous bearing and a consequent equal or symmetrical distribution of transmitted pressure. In some cases wrought iron girders are riveted in complete divisions or sections, which, being faced at their ends to the proper obliquity, are built up in much the same manner as the segments of cast iron ribs. The caps of piles are faced in the lathe to afford a true bearing.
This is synonymous with Socket Joint.
Ferrule Joint occurs when a ferrule or small hollow metal cylinder, prism, or cone enters into the joint, or, in other words, forms one of the meeting surfaces. When slipped over a bolt and used in conjunction with it to keep at a fixed distance apart the surfaces bolted to one another, it may be flanged. In iron fencing, a ferrule joint is made when a ferrule similar to that represented in Fig. 82 is passed through a hole in an iron standard to hold the ends of horizontal round or square bars, which are inserted and riveted therein. It is also produced between a main and service pipe, when tapping the former, by driving or screwing a piece called a ferrule, usually of brass and either straight or slightly cranked, or of elbow form, into a hole pierced with a driving punch or drill in the main to receive it. A driving ferrule is formed with a slightly conical end and a lug or shoulder for hammering on. In punching a hole, its site is first chalked on the main, and previous to punching out, its outline is closely dotted round with the punch so that there may be no risk of exceeding the required size. The hole thus pierced being jagged, it is rimered out to a true circle with a six or eight-sided rimer. The best plan, however, is to drill the hole with a drill clutch and ratchet, or other brace. When a screw ferrule is used, the hole made either way must be tapped with a full and perfect thread to match that on the ferrule.
Fish or Fished Joint is formed when two plates meeting at a butt are fished with a cover plate on one or both sides, the whole being riveted or bolted through together.