Show how flow criminals atay ile I 1 detected when the hand touches anything it leaves upon the object touched tauche d a re representation I 1 re sen tation of that part which came in contact with the object this impression la is not visible to the eye it la id made by the add acid of moisture exuded from the skin it you place the palm of your hand flat on oil a sheet of blank paper you may not see the tain faintest test trace of the hand and many people will be angry at the suggestion that there Is any exudation their hands handa are perfectly dry they do not suffer buffer from perspiration nevertheless it a metal plate covered with a certain chemical preparation be passed over the paper the representation of the hand becomes visible in great detail A french brench expert declares that when a burglar touches a curtain or a doorpost or anything else he leaves the mark behind him and it la Is possible to get a picture of it even if he walks across the tha carpet in hla his socks he will leave a picture As the markings of the hand are quite distinct in each individual these pictures may prove useful in bringing crime home to the perpetrator pe |