[D8639S], Letter from S K Dingle to Thomas Alva Edison, June 12th, 1886

Item

Abstract

Had a clear train of 3 cars yesterday; late in the p.m. changed the coil on the train from 3.5 ohm prime, 665 sec. to 7 ohm prime 150 sec, when Rudd got me "fairly" and where wires came within 6 feet of track, "got me fine"; Tests on 600 ft-long iron bridge with wooden ties over the Mississippi with a train of 4 cars showed that could read Rudd "all the way across," though he "doesn't get me at all"; "Rudd gets me fairly when wires are level with car tops" 60 ft. away, but "hardly at all when wires are up on a bank" 30 ft high with poles about 50 ft away.###Dispatchers missed our presentation here before they returned to Chicago, but we should catch Supts. next week.[see D8639P] ###The improved phones arrived this p.m. but didn't get a chance to test; Graves [not in database], supt of telegraph on this division, came out to the train and spoke with Rudd; it worked well, Graves "astonished"; Graves went out to Merriam Park but induction was bad; before Rudd fixed it, Graves was called away due to wreck at St. Paul of special train with delegates to yardmasters convention; nobody killed; will have about 3 days experimenting before supts. arrive.

Author

Mentions

Date

1886-06-12

Decade

1880-1889

Type

Identifier

D8639S

Folder Set

D8639

Title

[D8639S], Letter from S K Dingle to Thomas Alva Edison, June 12th, 1886

Microfilm ID

79:1160

Publisher

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