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The Iris diaphragm in the condenser. (the lever sticking out just above the "8" in the image above.
Although the Lab Manual describes it, here it is... Iris Diaphragm: used to regulate the amount of light entering the lens system. Coarse-adjustment knob: used to raise or lower the body tube of the microscope. Fine-adjustment knob: used to bring specimen into sharp focus. Condenser: controls the maximum numerical aperture and to move the condenser itself. Mechanical stage control: used to adjust the slide vertically and/or horizontally to bring slide into central opening of the objective.
There is only one condenser. That would be an air condenser.
To remove air and noncondensable gases from a main steam condenser
Not clear on "cracked condenser", but a bad condenser in the distributor would cause the points to wear out quickly, which could easily keep the truck from starting.
The AC condenser would effect the performance of the AC system in the car.
The way that you use language appropriate to the audience is to know your audience. Once you know who your audience is, you would adjust your vocabulary and speech to suit the audience. For example, you would adjust differently for a group of kindergarten students and a group of doctors. The purpose of communication is make yourself understood.
Brightness can be changed by changing the voltage to the lamp and adjusting the condenser and diaphragm/pinhole apertures.
To adjust oneself to different conditions, to suit a new or different purpose
if i had the answer would i ask you