[LB007866], Letter from Thomas Alva Edison to Western Union, George A Hamilton, August 8th, 1882

Item

Abstract

Referring to your favor of 7th inst One of our Z machines [should] be [wound] to give say three volts its resistance would be one ten thousandth of an ohm. We have two armatures now that we use in our regular Z machines one of [.005] ohm resistance and giving 55 volts and one of .14 ohms giving 110 volts. Five hundred [lines] of 100 ohms each could be worked from this machine making the external [resistance] 2 ohms or fourteen times higher than the internal resistance requiring about 200,000 ft lbs of electricity or nine horse power of which 1/14 only is lost on the machine bobbin 1/2 horse power for friction and 7000 ft lbs on [fluid]. We [now] guarantee the machine to run perfectly [s---] and give a steady current [This] [--] [regulator] [Z] as when $1200 set up. We also make attachments to commutators whereby you can run several circuits from the same bobbin each having different volts

Date

1882-08-08

Decade

1880-1889

Type

Identifier

LB007866

Folder Set

LB007

Title

[LB007866], Letter from Thomas Alva Edison to Western Union, George A Hamilton, August 8th, 1882

Microfilm ID

80:795

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University

Item sets