HC Deb 11 March 1930 vol 236 c1117W
Mr. DAY

asked the Postmaster-General whether any mechanical device is being fitted to the switchboards of private automatic telephones so that the call signals of a number can be detected by blind telephone operators?

Mr. LEES-SMITH

The equipment normally provided on telephone switchboards accommodating 25 lines or less admits of the installation being operated without difficulty by a blind person. Experiments are proceeding with a view to enabling blind persons to operate larger switchboards also.