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ELECTRIC ALARM FOR CLOCK.

The method of putting an electric contact upon the dial "of an alarm clock in order to ring a bell when the hands come to the right point is well known, as is also the method of wrapping a cord about the winding key so as to have it pull a switch. However, au these cases' imply modifying the clock in one way or another. What is desired is not to make any change whatever upon the clock, and this is realised in a vibration method used by a French inventor. All that is needed is to put the clock on a shelf or the cover of a box, the shelf having a main flat part for the clock and in front a sloping part or slideway. On the slideway a metal bar is laid, and below it are two contacts, such as screws or nails, so that when the alarm goes off the vibration of the shelf will cause the bar to slide down and make the contact. An alternative scheme is to pivot the bar at one end, with a contact stud lying below the other end. In this case one wire is connected to the bar and the other to the stud, so that the bar swings down and makes the contact. The battery and electric bell can be placed inside the box, and the top is used for the shelf.

Permanent link to this item

https://paperspast.natlib.govt.nz/newspapers/ROTWKG19120828.2.50.4

Bibliographic details

Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 28 August 1912, Page 7

Word Count
238

ELECTRIC ALARM FOR CLOCK. Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 28 August 1912, Page 7

ELECTRIC ALARM FOR CLOCK. Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 28 August 1912, Page 7

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