Not quite sure why this requires such a huge speaker, or any speaker at all…
Sound Film Now Repeats Dialed Telephone Numbers
THE principal convenience of the dial telephone was that it enabled you to pick your own wrong numbers, but even this is done away with now by a sound film which repeats the number which you have just dialed and enables you to correct the mistakes which you may have made.
The new invention does not necessitate the use of the subscriber’s voice. The subscriber merely dials the number and that number is called to central as the sound film automatically repeats the number through a loud speaker. The new method is expected to be put in use before the end of the year. Read the rest of this entry »
If they had already perfected explosion-proof telephones in 1935, why can’t I use my cell phone at the gas station? Has this miraculous technology been lost?
SAFETY PHONE GUARDS AGAINST EXPLOSIONS
A new type of explosion-proof telephone, exhibited in Chicago, is a recent addition to the roster of curious safety appliances developed especially for use in industries where dust, gunpowder, or inflammable gases present the constant hazard of a blast. Not only does the construction of the instrument guard against the possibility of an electrical spark igniting any combustible material in the surrounding air, but even the mechanical working parts have been designed particularly with a view to reducing friction so that a spark cannot be produced.