Music - Orchestra Plan Layout - Wind Section

ORCHESTRA   

Woodwind Instruments  

(to the right of the piano and the harp in the above layout) 

2–4 Flutes - demo (one doubling Piccolo)
2–4 Oboes - demo (one doubling cor anglais or English horn)
2–4 Clarinets - demo (one doubling Bass Clarinet)
2–4 Bassoons - demo (one doubling Contrabassoon)
The size of the woodwinds section can be expressed as 1-1-1-1 (chamber), 2-2-2-2 (Brahms), 3-3-3-3 and 4-4-4-4 (with doubling). 

Brass Instruments  

(beyond the woodwinds in the above layout)  

4–8 French horns - demo
2–6 Trumpets - demo
2–6 Trombones - demo (one or two doubling Bass Trombones)
1 Tuba - demo    

Source: Wikipedia