Electrocardiograph, which measures electrical impulses associated with heartbeats and makes a permanent recording of heart action, is used in certain types of cases. Heartbeats are picked up from metal plates attached to ankles and wrists by straps.
On negative sleeve: DIAGRAMS WHICH BLIND CAN 'READ'--Diagrams embossed on aluminum foil by the Faximile visograph, now being used for experimental study at the University of Michigan, as they appear before the foil is removed from the machine. these diagrams have been enlarged four times over the size of the sheet of "copy" inserted in the visagraph. They are embossed so that the blind can follow them by touch rather than sight
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