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That action is often called a double action, but Mike is correct, it is actually trigger cocking. To fire single action, the bottom trigger is pulled with the middle finger while the index finger is off the top trigger. The bottom trigger is then released. That cocks the hammer (hence "trigger cocking" as opposed to "hammer cocking", like the SAA Colt); pulling the top trigger releases the hammer and fires the gun. To fire "double action", the shooter uses both the index and middle finger, holding the top trigger while pulling both triggers. That cocks the hammer and releases it; not technically DA, but effectively the same.
I am going to do some digging - no guarantee of results, but I'll give it a shot (OK, bad pun).
Jim
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