The Thomas A. Edison Papers Digital Edition

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Title

[X001M6AI], Letter from John Kruesi to Thomas Logan, January 12th, 1888

Editor's Notes

[NOTES ON THE WRONG DOCUMENT. TECHNICAL REFERENCE. DYNAMO SPECS] Edison Dynamos: J Dynamo, 100 lights, 1450 rev. has 4 cores J Dynamo 100 amperes, 1075 rev. has 2 cores S Dynamo, 200 lights, 1200 rev. has 2 cores about 24" long S Dynamo 200 amperes, 150 rev. has 2 cores about 20" Y Dynamo 300 lights 1200 rev. has 2 cores 24" long Y Dynamo 300 amperes 1150 rev has 2 cores 20" long and about 15 outside diameter H dynamo 350 lights 1150 rev. has [xxx] cores about 40" long H dynamo 400 & 450 lights 1150 rev. has 6 cores about 25" long H dynamo 400 amperes, 875 rev. has 4 cores Dynamos whose capacity is rated by "lights" givve only 110 volts rated in amperes give 125 volts Larger sizes are being built to give and 140 and 150 volts Magnet connected of Standard Dynamos [xxx] rotate round right buil men on connect inside wires to each other and side voices to nearest pole of dynamo. Armature rotates L. to R. connect outside end of trouble and insdie and to nearest [xxx]. [Giarnt Table] Connections of Compound Dynamos, July 28 1888. Inside end of coil (2 wires) on S pole of magnet should be connected to bottom brush (+) Current should flow through governing magnet coil in direction of arrows in the diagram, connect dynamos turning in around "inside" govering coil as shown in diagram (Image of a diagram of a dynamo) Points on Standard Dynamos The lower brush is always position where dynamos leave the shop. Facing the switch or commutator end the right head magnet is of S. polaric the left hand pole is always N. The outside wire of the magnet coil on right hand side should be connected to the outside wire of the left hand coil through the resistance box or regulator. The inside end of the right hand coil is connected to the position brush and the inside end of the left end coiled to the negative brush. In winding cores of dynamos magnets the top end of core is set towards chuck [xxx] of lathe. Facing chuck end of lathe the Spool revolves same direction as hands of a catch. The inside end of the window is made double (2. wires) to prevent loss of wire if end is broken off. Thus the end composed of two strands is the inside end. The outside end of coil is a single wire and should carry the current into the coil or in other words this outer end of coil should be + to the inculded or double end of the coil on N pole of dynamo and thereverse on the S. pole of dynamos. Conductors: The function of the neutral wire in the Edison Three wire system" in my opinion is to enable us to extinguish each lamp separated. All consumers who do not especially desire to controll lane single should be wired two lamps in series between the outside wires, +, -. Newburgh, NY, Aug. (xxx] Resistance of a circular mill foot of copper at 60 F (conductivity 100) is '10 32311 ohms. (stated Geo B Prescot Jr. to be 10.381 ohms) 200 cir. Mills will carry 1 ampere 10 feet with 1% loss according Geo B. Prescot Jr. [Cost of three-wire feeders + sub feeders per 16% 50 watt, 110 volt lamp Formula ) (Graph of data / formula) (Cost of three-wire feeders per 16 c/p 50 watt, 110 volt lamp) (another graph) (Cost of three-wire feeders per 16 c/p 50 watt, 110 volt lamp) (another graph) (Cost of copper per [xxx] for 400 volt motor (another graph) (Cost of copper per [xxx] for 800 volt motor (another graph) (Cost of copper per HP for 1200 volt motor) (another graph) Indicators To determine if comparative indicator be connected correctly When a current flows from I + to C Needle should point high, and vice very when a current flow from I + to C the + indicator the needle should point it and vice versa When a current flows from I + to C + on - indicator the pointer should go high vice versa When a current flows from I - to C- to pointer should go low and vice versa J.W.Howell Power To find speed of Leader Multiply the diameter (or number of teeth) of the Driver its number of revolutions and divide by the diameter (or number of teeth) of the Leader To find diameter of a Leader to make a given speed Multiply the diameter of the driver by its number of revolutions and divide the product by the required number of revolutions To find diameter of Driver Multiply the diameter of Leader by its number of Revolutions and divide by the number of revolutions of the Driver To find speed of Driver: Multiply the diameter of Leader by its number of revolution and divide by the diameter of the Driver

Author

Kruesi, John

Recipient

Logan, Thomas

Date

1888-01-12

Type

Letter

Subject

Manufacturing

Telephone

Folder ID

X001M6-F

Document ID

X001M6AI

URL

https://edisondigital.rutgers.edu/document/X001M6AI

Rights

Henry Ford Museum and Greenfield Village Research Center

Publisher

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

License

CC0 1.0 Universal

Item sets

[X001M6-F] Edison Pioneers -- Logan, Thomas