[LB050030], Letter from Thomas Alva Edison to Bethlehem Iron Co, June 16th, 1891
https://edisondigital.rutgers.edu/document/LB050030
Transcription
June 16. 1891. Bethlehem Iron Co., Mr. R.W. Davenport, Ass’t. Sup’t., South Bethlehem, Pa. Dear Sir:- We have received and tested the twelve experimental castings A 1 to 6, B 1 to 6. Referred to in your letters of the 8th and 11th instants. We have had have found that the B castings are superior to the A’s generally, A 1 containing the most blow holes, and, in fact, being unfit to test: A 3 is next to it in inferiority. On the other hand, No. 4 B does not seem to have a single blow hole, and is also best from a magnetic point of view. 5 B and 6 B are next to it in mechanical and magnetic order. If you can succeed in duplicating any of these (4, 5 & 6 B), particularly No. 4 B, our works at Schenectady will be quite satisfied. They have been instructed to forward to you to-day, by express, a pattern of a machine for a trial casting in steel. Will you be so good at the same time that you cast this, to give us one’er two rings from the same heat, to be forwarded to us for test when you send the casting to Schenectady. Please keep the carbon as low as possible, adding such other ingredients as you may consider necessary in order to secure fluidity. Of course the less impurity so added, the better will be the magnetic result. Yours very truly, Tho A. Edison