[NM020AAX] Technical Note, July 1st, 1886
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Title
[NM020AAX] Technical Note, July 1st, 1886
Editor's Notes
"Patent No 2 Lamp Co acct Soak patent Dyer-- Take out patent on a sprengel pump same as we use except the use of Sulphuric acid instead of mercury to get the vacuum The fall tube is about twenty feet long we use Lead of Hard rubber fixtures & mechanical pumps to handle it= The sulphuric is very strong, get broad claim, object is to dispense with mercury as its expensive and dangerous while the men can protect themselves by mica masks for accidents, they cant form the insidous Mercury besides it getst the Vacuum free of mercury vapor The very little vapro from Sulphuric acid may be absorbed by a substance which will combine with it such as an oxide of a metals through which the vapor must [page???] getting to Lamp-- its [substance?] acts also as a drying agent though I prefer to still use the phosphoric anhydride in addition-- it doesn’t break the tube by pounding & tube is always clean Edison P.S. No diference in pump from the regular except length o fall tube E"
Author
Mentioned
Date
1886-07-01
Type
Subject
Folder/Volume ID
NM020-F
Microfilm ID
44:729
Document ID
NM020AAX
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University