This is a photograph of the Maschinengewehr 08 Machine Gun:
The Maschinengewehr 08, or the MG08, was the German Army's standard machine gun in World War I.
It was very similar copy of the Maxim Machine-Gun.
The German Army delivered over 12,000 of these machine guns on the Western Front during 1914.
The MG08 had a practical shooting range of 2,200 yards and an maximum range of 4,000 yards making it a decent weapon.