Kromdraai Gold Mine General artefacts in the museum (Image: Gauteng Tourism Authority) Gold is central to the history of Gauteng and it was only as recently as 1886 that the city of Johannesburg was founded, mainly due to the vast amounts of gold to be found in the area.
3000 yards on each spool of dark pink thread. Ideal for light to medium weight structured fabrics. â¢ Shrink and abrasion resistant.
When you find the number of threads per inch, a fractional screw size would be written: diameter-threads per inch. Example: 1/2-20, 1/2 (inch) being the diameter and 20 threads per inch. click on pictures to enlarge. Most hobbyists don t have a thread pitch gauge, so you can use a scale.You can count how many thread crests are in an inch. If the fastener is short, measure how many in a quarter inch, then multiply by 4.he following is what I explain to my students how screw threads are described. Screw threads have two descriptions. One is its diameter, measured to the height of the threads. The other is how many threads per inch. Or, in metric use, the pitch of the threads that is the measurement from one crest to the next.