CELPIP Reading Part 3Reading for Information Practice

A. Growing cities once depended on messengers who carried telegrams, documents, and small parcels through crowded streets. Delays caused by traffic encouraged engineers to seek routes that did not compete with carts or pedestrians. Pneumatic networks placed sealed tubes between offices and used air pressure to move cylindrical carriers through them. Large installations linked post offices, financial districts, and government buildings where a few saved minutes could matter. Viewed together, details about the need for rapid urban document delivery connect visible characteristics with processes that are less immediately obvious to an ordinary observer at first.

B. An operator loaded papers into a padded carrier and closed its cap before inserting it into a dispatch chamber. Pumps created higher pressure behind the carrier or lower pressure ahead, producing the force needed for travel. Curves had to remain gentle enough for a carrier to pass without jamming against the tube wall. Valves and junctions directed carriers toward selected branches, while signals told receiving staff that an item was approaching. Within development and operation of pneumatic tube networks, the result is a system in which structure, timing, and local conditions remain closely connected throughout continuing development.

C. At each station, workers recorded dispatches, emptied arriving carriers, and returned empty containers to useful locations. Colour, labels, or numbered markings helped prevent documents from being sent along the wrong branch. The narrow tubes restricted both the dimensions and weight of objects, making the network unsuitable for bulky freight. Fragile items needed protective packing because starts, stops, and contact with tube walls could produce sudden shocks. Observations of station routines and limits on transported items show why the same process may appear somewhat different from one site to another as surrounding conditions continue to change.

D. Telephone and electronic data systems eventually removed much of the demand for rapid paper transmission between offices. Many citywide networks closed when aging underground tubes became expensive to repair and document traffic declined. Shorter systems survived in hospitals, factories, and shops where physical samples, cash, or medicines still required movement. Reliable operation depends on clean tubes, intact seals, balanced airflow, and quick access to any carrier that becomes stuck. Understanding development and operation of pneumatic tube networks therefore requires attention to both immediate effects and slower forms of change within the whole connected system.

E. Not given in any of the above paragraphs.