. Bell telephone magazine . s of new models, ideas for ad-Iiance product development and cost reduc-< ion are put through an exhaustive series ofI tandardized and improvised tests conceived ■ it the laboratory. Only the best survive. Set off from the cadence of telephoneProduction, the P&R Lab consists of twol,potless, air-conditioned rooms where relativehumidity is kept at 50 per cent. The lab is a veritable side-show. A drop test mechanism, which resembles a guillo- : line, simulates the stress on a phone acci-dentally dropped from a desk or machine removes and hangs up r
. Bell telephone magazine . s of new models, ideas for ad-Iiance product development and cost reduc-< ion are put through an exhaustive series ofI tandardized and improvised tests conceived ■ it the laboratory. Only the best survive. Set off from the cadence of telephoneProduction, the P&R Lab consists of twol,potless, air-conditioned rooms where relativehumidity is kept at 50 per cent. The lab is a veritable side-show. A drop test mechanism, which resembles a guillo- : line, simulates the stress on a phone acci-dentally dropped from a desk or machine removes and hangs up re-f:eivers to subject equipment to the rigors ; bf accelerated time involving several hundredithousand repetitive operations. Anotherunique apparatus which looks something likea wheelbarrow simultaneously drives severalitelephone dials to failure; it usually takes acouple of million rotations—the equivalent of:about 160 years of average use. Two eraser tipped poles operated bycompressed air, which makes them sound. Whcelbanow-like device tests phone dials. like a toy steam locomotive, perform a lifetest of the recall button on the Trimline5phone. The button, built into the phones re-ceiver, permits a conversation to be endedwithout depression of the switchook. Failureusually occurs after 100,000 depressions. Sheltered from these sounds are about100 square feet of silence: the quiet , amidst walls of fiberglass wedges thatconsume sound, tests are made that deter-mine the audio qualities of buzzers, ringersand gongs used with the telephone. Other test apparatus includes a tempera-ture-humidity chamber where telephones areexposed to temperatures ranging from 60 de-grees below zero to 160 degrees above zeroat a relative humidity exceeding 90 per corrosion test cabinet gives a telephone a24 hour salt spray bath equivalent to 20years of continuous exposure in a typicalsalt fog atmosphere much like that found incoastal regions. There is even a transporta-tion simul
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
