manifest
type: Manifest
label: [X001M2AN], Letter from Wilson Stout Howell to Samuel Aldrich Crozer Jr., Edison Electric Light and Power Co (St Paul), December 1st, 1888
metadata:
  label: Title
  value: [X001M2AN], Letter from Wilson Stout Howell to Samuel Aldrich Crozer Jr., Edison Electric Light and Power Co (St Paul), December 1st, 1888
metadata:
  label: Editor's Notes
  value: Dear Sir: I hereby present for your consideration the following report of the of the inspection of your plant at St. Paul. The main object of which is to make know to you the present condition of the plant from the department to the lamps, its faults and their remedies. Concurring the motive power I have nothing to report not being competent to treat upon such subject. I shall therefore begin with the dynamos and end with the light. ## The twelve #20 dynamos are in excellent condition so far as their appearance indicates. The only fault apparent being that some commutation are worn down so that the bars are too think to carry current without excessive heating. All commutations are kept clean and smooth and are much better than [xxx blurred out] average. In #20 dynamos is built for 400 amperes at 125 volts and any increase of either the current or the pressure means an overload. Your [xxx] load is a little over 2000 amperes on each "side" of the three wire system. To carry this load you employ five pairs of dynamos, five dynamos on each "side", each dynamos carrying, for about an hour each day, 400 amperes at 145 volts, which is an overload of 16% or equivalent to a load of 464 amperes at 125 volts. An overload of this character is in some respects worse than an ordinary overload of current at a pressure of 125 volts or lower because the magnets of the dynamos are much stronger with the higher voltage and the Foucault currents set up in the iron core of the armature not only take additional power but cause much extra heating which is injurious to the insulation of the armature conductors. In view of these facts it would be wire to run six pairs of dynamos during your heaviest load, provided that you have plenty of stance, for them all the dynamos would be running a trifle below their capacity and the armatures would be much less liable to injury. The reason for such an excess pressure at the dynamos is that the feeders are too small to deliver the maximum load of the…
metadata:
  label: Author
  value: Howell, Wilson Stout
metadata:
  label: Recipient
  value: Edison Electric Light and Power Co (St Paul)
  value: Crozer, Samuel Aldrich, Jr
metadata:
  label: Mentioned
  value: Edison Machine Works
  value: Leonard and Izard
  value: Finn, George H
  value: Bergmann & Co
metadata:
  label: Date
  value: 1888-12-01
metadata:
  label: Type
  value: Letter
metadata:
  label: Subject
  value: Management (companies and organizations)
  value: Central stations
metadata:
  label: Folder ID
  value: [X001M2-F] Edison Papers and Related Items
metadata:
  label: Document ID
  value: X001M2AN
metadata:
  label: URL
  value: https://edisondigital.rutgers.edu/document/X001M2AN
metadata:
  label: Rights
  value: Henry Ford Museum and Greenfield Village Research Center
metadata:
  label: Publisher
  value: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
metadata:
  label: License
  value: CC0 1.0 Universal
metadata:
  label: Timestamp
  value: 1 December 1888
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