The predecessors to trumpets did not have valves; however, modern trumpets have either three piston valves or three rotary valves, each of which increases the length of tubing when engaged, thereby lowering the pitch.
Tips for printing coloring book page or coloring sheet:
Step 1: Click on "Print" link of your choice, if you want a
The trumpet image for coloring yourself then you need to click on "Print
The trumpet Coloring page (B/W)" link. If you want colored (already filled with colors)
The trumpet graphic to print then click "Print
The trumpet Coloring page (Color)".
Step 2: Now a new pop-up window will open along the
The trumpet image of your choice (if new window does not open-up then you may need to check your pop-up blocker settings.). Now click on "PRINT". This will open printer dialog, select your print and print.