Identified! [Daniel W. Kessler of the National Bureau of Standards with device used to test slabs of marble over long periods of time] ? (LOC)
| Uploaded by | The Library of Congress |
|---|---|
| License | No known copyright restrictions |
| Comments | 15 |
| Favorites | 35 |
| Views | 22,812 |
| Date taken | 1925 |
| Date uploaded | 2015-10-02 |
| Tags | libraryofcongress, dc:identifier=httphdllocgovlocpnphec45047, xmlns:dc=httppurlorgdcelements11, danielwkessler, bureauofstandards, dwkessler, stone, testing, apparatususedformakinglongperiodscrubbingtestsonmarble, mysterysolved |
| Visibility | public |