โ Scribed by Coleman Sellers 3rd
No coin nor oath required. For personal study only.
Now that the Joint Commission from Great Britain, Canada and the United States has agreed upon a standard for screw threads for use in the three great English speaking countries, it is interesting to recall that The Franklin Institute had a major role in establishing the United States Standard Thread, from which was derived the American Standard, and which now becomes the International Standard with only slight modification.
In the early days of the nineteenth century when the industrial age was beginning to blossom there were no standards in general use. Each manufacturer set up his own system of tapers, shaft fits and screw threads. Indeed, even bolts made by two mechanics in the same shop might differ radically in shape of threads or in pitch. Gradually, prominent shops, and sometimes neighborhoods, evolved standards of their own which usually differed from those of their competitors and manufacturers in other locations. As late as 1868 the Brooklyn and Portsmouth Navy Yards used one system and the Boston and Philadelphia Navy Yards used an entirely different system. The two systems were not interchangeable, a fact which must have enraged and embarrassed many a Naval Officer of that time when it came to repairs.
The first progress towards standardization of screw threads was made in England. This is not surprising, as British industry was unquestionably ahead of that in the United States in those days.
๐ SIMILAR VOLUMES
## &mdaru' Set-ew Thread. [Jour. Frank. In&., as flax, hemp, jute, and other of a similai nature, by enabling producers to deliver t,hese several fibre,, in a c&An, straight, long-line, marketable shape, at low cost. lJnlike cotton, which is comparat~ively a delicate plant that can only be grown p