First let me tell you that this information is not teaching you how to conjure up a spirit, it is simply an article that sheds some light on one of the tools used in the Art. The Triangle of Solomon, the second most important tool for the conjuring magician, next to the magick circle.
The Triangle of Solomon is used in conjunction with the magick circle.
What is it and what's its purpose?
It is used in the conjuring of the demonic or celestial/angelic spirits. It is in this Triangle that they will appear and are forced to obey. They are forced because it has the 3 Sacred names of God - Tetragrammaton, Primeumaton and Anaphaxeton, one on each side. It also contains the name Michael (Archangel Michael) which is split into 3 sections MI - CHA - EL. This contains the spirit and compels them to obey.
This does not mean that in every case they are going to obey you, but it helps the process. Some magicians, such as the great Crowley, would use fresh blood of a sacrificed animal in the Triangle to attract the Demon. For blood is the life force and demons thrive on it. Crowley would sacrifice three white doves and pour the blood into each corner of the Triangle, then the demon would stay until the life force was exhausted. This is of course not something that is supported or asked of you to do, in this article.
Those of you whom are reading this are not the experienced and you would only end up possessed or worse. This is just for your interest and thirst for knowledge.
How to make the Triangle
You can trace it on the ground, in dirt or sand, this is not the greatest way to do it however. You can also make one out of wood and paint it. The Triangle and the letters themselves should be black, along with the black circle in the middle of it. The interior should be white, you can do it differently though, if you so choose so.
With this method you can set it on the ground and take it with you when you are done with your magical operation. These two methods are good, if you are trying to conjure the spirit into the physical realm. The best dimensions would be 36"x36"x36".
Using other tools with the Triangle
Now the other method is for conjuring the spirit into a crystal ball that is placed in the middle of the Triangle, or using a black mirror in the middle of the Triangle. With this method one conjures the spirit, but one must scry or see onto the astral plane where the spirit is.
The mirror or crystal ball only acts as a focal point. You can set up the Triangle on a small round table and place a crystal ball in the middle or you can prop up the Triangle so that it is standing up, and gaze into the black mirror, once again, you must be able to scry.
Those whom have not developed the ability of scrying or crystal gazing will have no success. This takes much practice with these tools, which is something you can do without conjuring any spirit and develop your astral vision and psychic senses.