Show light ray advocated as perfect burglar alarm A new invisible light ray burglar a larm for which striking claims tire fire made tins has just been added the various devices dei ices designed to make that profession profess prof eslon lon thoroughly precarious the device known qs is the seeing Afa machine chine was demon demonstrated stinted recently at the lie technical high school in bertin before an audience which pronounced it to be the most reliable assurance against burglary existing from if a transmitting apparatus filtered infrared infra red light rays nis are sent out t towai founis 1 I a receiving ripp aratus according c 0 to a united iress correspondents description between the transmitter tit at one end of the room or where the device dece Is installed and the receiver tin nn area of light Is created but since the rays ray tire invisible to the human fie eye the light area cannot be perceived mould a burglar enter tills this invisible light ray area an alarm Is set in motion the light ray apparatus Is sold said to work whether the room in which it Is installed Is in darkness or in daylight dai light in order that false alarms not be given through mice or rats entering the light area the apparatus Is so devised demised that only objects of a certain size bring it into fiction action the apri tatus can also be used as aa a fire alarm since a clond of smoke entering the light ray lay area operates the alarm |