After
manufacturing the telegraph equipment the machine shops,
Edison sold directly industry. Among the products
actually manufactured the lab were telegraph signalling
sets, phonographs, electric meters, and chemicals and plates
used storage batteries. Edison found more economical way
to make India ink and set manufacture West Orange. There was great
demand for phonoplex sets from the railroad industry and Edison
made handsome profits manufacturing the device. August 1887 Tate wrote Insull that the task
of building the lab "was going require good deal more
money than was first anticipated.
Despite the flow money from paid research, Edison was
still plagued with shortages operating funds." Consequently, Edison
. The phonoplex was a
successful invention that enabled telegraph and telephone
messages sent over the same wire.
The availability two large machine shops the
laboratory complex provided the opportunity make money from
manufacturing telegraph instruments.11-22
commercial success, but Edison had several highly lucrative
telegraph products hand generate funds. His finances
had been stretched the costs building the laboratory and
his great optimism had led him undervalue the expense of
experimentation and overvalue the commercial worth its
product. As
soon the phonograph was perfected, the lab was put work
manufacturing the cylinders, both blank and recorded, for the
new machine
