It is called a solenoid. Apply 12 volts and it will whack the element.
From: Tom Osborne <email@example.com>
>Date: 2006/12/23 Sat PM 04:39:15 CST
>To: Towertalk <firstname.lastname@example.org>
>Subject: Re: [TowerTalk] Help! Lots of Birds on Tower Problem !
>Be neat if you could put some kind of small motor up there with a little
>hammer that you could get to come around and tap the element every once in a
>> Many have recently written about the problem of birds >on/around our
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