[LB024477], Letter from Samuel Insull to Grace (W.R.) & Co, June 2nd, 1887

Item

Abstract

In reply to your letter 23rd inst. I beg to say that the Ore Milling Machine only seperates gold from magnetic iron sand. If the Iron sand is mixed with quartz the gold and quartz will fall on one sid and the magnetic iron sand on the other. The separator is only useful where the gold is found in alluvial sand with large quantities of iron sand. It requires a 3 horsepower engine and boiler and a (?) horsepower dynamo and separator. Cost of Engine Boiler (illegible) $300 ## Dynamo 250 ## Separator 850## The same engine and dynamo will run two seperators each of which will separate one hundred tons of iron sand in ten hours.

Recipient

Date

1887-06-02

Decade

1880-1889

Type

Identifier

LB024477

Folder Set

LB024

Title

[LB024477], Letter from Samuel Insull to Grace (W.R.) & Co, June 2nd, 1887

Microfilm ID

138:142

Publisher

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