Final answer:
During warm weather months, pressure on the pantographs piping can be manually relieved using methods such as friction and harnessing sunlight for heat.
Step-by-step explanation:
In order to manually relieve the pressure on the pantographs piping during warm weather months, you can use methods such as rubbing your hands together or harnessing sunlight for heat. These actions create friction or provide additional heat, which can help relieve the pressure.
For example, when you rub your hands together, the friction generates heat. Similarly, harnessing sunlight can warm a room or drying clothes outside, which helps in relieving pressure caused by thermal stress.
It is important to note that forces and pressures due to thermal stress can be significant. During hot days, railroad tracks and roadways can buckle without sufficient expansion joints, power lines can sag more in summer, and cracks can open and close in plaster walls as a house warms and cools.