Telegraphy the sense of a system that can transmit arbitrary messages over arbitrary distances. Lines of signalling relay stations can send messages to any required distance, but all these systems are limited to one extent or another in the range of messages that they can send. A system like flag semaphore, with an alphabetic code, can certainly send any given message, but the system is designed for short-range communication between two persons. An engine order telegraph, used to send instructions from the bridge of a ship to the engine room, fails to meet both criteria; it has a limited distance and
Direct holding system while in transit, securities were not available for use or investment, causing what has been called "pipeline liquidity risk". Because of these disadvantages, the "direct holding system" has been replaced by the indirect holding system. Settlement by physical delivery of certificates worked adequately until the 1960s, when a sharp increase in trading volumes overwhelmed the system. The amount of paper that physically had to be moved around led to the famous "paperwork crisis" on Wall Street in the late 1960s. This provided the impetus for the introduction of the indirect or multi-tiered holding system. Although the indirect or multi-tiered holding