A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit.heostats are a kind of potentiometer. These devices can be used in a variety of settings, and are usually designed to be sealed so that environmental factors cannot interfere with the function of the circuit.
This chemical can cause allergic rhinitis and its symptoms, including a runny nose, sneezing, and itchy eyes. In addition to tree pollen, other common allergens include: grass pollen
This encounter causes rhinitis or the immediate inflammation of the nose, and conjunctivitis, the inflammation of the eyes. 1  Aside from these two symptoms, a person with hay fever may also experience the more common symptoms such as runny nose, blocked nose, itchy red eyes and nose, and sneezing.ay fever or seasonal allergic rhinitis is an allergic reaction caused by hay or grass pollen. From the months of March to May, this allergic reaction is commonly caused by other pollens like tree pollens but from May until July, hay fever due to grass pollen becomes very common.