A Wiper Generally Consists Of a Metal Arm, Pivoting At One End And With a Long Rubber Blade Attached To The Other. The Arm Is Powered By a Motor, Often An Electric Motor, Although Pneumatic Power Is Also Used In Some Vehicles. The Blade Is Swung Back And Forth Over The Glass, Pushing Water Or Other Precipitation From Its Surface. The Speed Is Normally Adjustable, With Several Continuous Speeds And Often One Or More "Intermittent" Settings.
A Wiper Generally Consists Of a Metal Arm, Pivoting At One End And With a Long Rubber Blade Attached To The Other. The Arm Is Powered By a Motor, Often An Electric Motor, Although Pneumatic Power Is Also Used In Some Vehicles. The Blade Is Swung Back And Forth Over The Glass, Pushing Water Or Other Precipitation From Its Surface. The Speed Is Normally Adjustable, With Several Continuous Speeds And Often One Or More "Intermittent" Settings.