Plain old telephone service. For direct inward dialing service, the telephone company provides one or more trunk lines to the customer for connection to the customer's PBX, and allocates a range of telephone numbers to the customer. Calls to such numbers are forwarded to the customer's PBX via the trunks.
A railgun is an electrically powered electromagnetic projectile launcher based on similar principles to the homopolar motor. railgun consists of two parallel metal rails (hence the name) connected to an electrical power supply. When a conductive projectile is inserted between the rails (at the end connected to the power supply), it completes the circuit.
The standard dimensions of the recoil. groove of the accessory mounting rail for small arms weapons. shall be as shown in Figure 2. 5.3 Lenqth of accessorv mountina rail. The length of the. accessory mounting rail is dependent upon the particular. application of Small arms weapon it is to be mounted on.