Click on PDF link below for more information G.C. Reiter Old Catalog Book PDF   TRIP ACTION BELLS The single trip action bell consists of a rugged cast frame and a spring loaded gong hammer. The bell operates by manually pulling a lever that releases the spring allowing the gong hammer to strike the gong shell. The bell rings once each time the lever is pulled. Model 60 – Grey steel gong shell in 4" & 6" models Model 50 – Brass gong shell in 4" model