In general, the foundations stops (Principal, Diapason, Montre) and the flutes are the two main types of stops on most types of organs. For example, the popular "Roller Moller" has two extended ranks; a Principal and a Flute which are unified to many different pitches. However, a theater organist might argue that the strings are used more often in that style of playing than are the foundations.
But, I suspect that what you are really asking is what the two main types or organ pipes are. The two main types of pipes are flue (not to be confused with flute) and reed. Flue pipes are simply a whistle with no moving parts. Reed pipes produce sound using a brass tongue not unlike the reeds in a harmonica. Classification of organ pipes break down further much like the taxonomic classification of life forms. For instance flue pipes break down into foundation, flute, string and hybrid. Reeds break down into still more diverse classes.
They are pistons or levers which control which set of pipes the air gets to; in other words, they control the type of sound produced. They are often named after the musical instrument they are supposed to sound like, eg. "flute", "violin", "Trumpet".
The pipe organ is a keyboard instrument.
The instruments most similar to a pipe organ are:Flute (pipe organ has flute pipes of different lengths)Harmonium
The keyboard instrument with pipes would be the humble pipe organ.
Peragallo Pipe Organ Company was created in 1918.
The first pipe organ, called the hydraulis, was invented in Greece.
The pipe organ was invented by the Greek Ctesibius.
The pipe organ is a keyboard instrument.
The instruments most similar to a pipe organ are:Flute (pipe organ has flute pipes of different lengths)Harmonium
Organ pipe coral was created in 1758.
There is none. The pipe organ was not invented. It developed in ancient times. However, there are thousands of patents concerning pipe organ parts.
Organ pipe cacti make no noise.
The pipe organ is a huge, complex machine. Possibly the most important part is the console, which looks like a big piano. It has multiple keyboards, called manuals, and a row of keys called the pedal board that you play with your feet. The manual also has several knobs called stops. By pulling out different stops (this is where the phrase "pulling out all the stops" comes from), you can make the organ play different sounds. Besides this, there are also the pipes, which are usually lined up parallel to the walls. Each pipe represents one key on the manuals and pedal board. The bigger the pipe, the lower the pitch.
The first pipe organ, called the hydraulis, was invented in Greece.
Peragallo Pipe Organ Company was created in 1918.
Moe Pipe Organ Company was created in 1991.
Organ pipe mud dauber was created in 1773.
The keyboard instrument with pipes would be the humble pipe organ.