Note 1 — Chapter I

Where reference is made to “hook clicks” in these instructions, the instrument is understood to be a desk stand, wall sets are so connected as to give only one hook click on raising or lowering the hook.

When reference is made to the red, white or green strand of the desk stand cord, it is understood that the red goes to the hook, the white to the receiver and the green to the transmitter, using the standard Western Electric cord.

When reference is made to L₁, L₂ or G you will find them on diagram No. 1 or No. 2. When reference is made to “A” or “B” you will find them on diagram No. 3.