Jeweled Safety Barrel Dissection – Elgin No. 240 B.W. Raymond
By A look inside the jeweled safety barrel from the Grade 240 B.W. Raymond reveals the barrel arbor attached to the main wheel while the mainspring is coiled inside the spring barrel. The top of the barrel is rigidly journaled to the winding wheel so that when the ratchet wheel rotates, the spring barrel rotates as well.
This deviation from the construction of the older going barrel is how the safety barrel protects the train in the event of the mainspring breaking.
