Search Results
- Title
- Determining the drying time of lacquer
- Date(s)
- 1937-12
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Description
-
How fast a lacquer or finish will dry is determined by the use of plate glass discs coated with the material to be tested and revolved slowly while a thin trickle of sand falls on them from a cone shaped container. It has been found by DuPont chemists that the point at which the sand no longer adheres accurately determines the drying time.
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_2782
- Collection
- DuPont Company product information collection
- Title
- A 'quartz fingernail' used to determine hardness of paint films
- Date(s)
- 1930/1939, 1930, 1939
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Description
-
A 'quartz fingernail' is used by DuPont chemists to determine how hard a paint film is. The device measures the weight necessary to drive the rounded end of a quartz rod a given distance into the film. In this manner the exact hardness of the paint is ascertained,
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_2779
- Collection
- DuPont Company product information collection
- Title
- Determining the degree of gloss
- Date(s)
- 1938-02
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Description
-
To determine the degree of gloss in a lacquer or finish, du Pont chemists use a device that measures the amount of light reflected. The light from a constant source is thrown back from the panel into the telescope tube. One half of the 'eyepiece' is illuminated by this reflected radiation, with the other half lighted by a small bulb in the photometer tube attached to the side of the telescope. This light is passed back and forth in the tube until the brightness of the two section meet. The...
Show moreTo determine the degree of gloss in a lacquer or finish, du Pont chemists use a device that measures the amount of light reflected. The light from a constant source is thrown back from the panel into the telescope tube. One half of the 'eyepiece' is illuminated by this reflected radiation, with the other half lighted by a small bulb in the photometer tube attached to the side of the telescope. This light is passed back and forth in the tube until the brightness of the two section meet. The distance of the light from the 'eyepiece' is then a measure of the amount of light reflected or the gloss.
Show less - Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_2784
- Collection
- DuPont Company product information collection
- Title
- Testing stencil paste
- Date(s)
- 1930/1939, 1930, 1939
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Description
-
A result of the testing of stencil paste in the control laboratory of the DuPont Philadelphia Paint Plant.
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_2785
- Collection
- DuPont Company product information collection
- Title
- Apparatus assembly, Jackson Lab, Deepwater Point, New Jersey
- Date(s)
- 1945
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4442
- Collection
- DuPont Company product information collection
- Title
- Burning liquid samples in Experimental Station laboratory
- Date(s)
- 1946
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Description
-
Assemblies of flasks, bubbler absorption tubes and enclosed lamps make possible the burning of liquid samples and the collection of the gases formed. Here a chemist and laboratory assistants at the Experimental Station operate apparatus for determining sulfur in liquid samples.
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4415
- Collection
- DuPont Company product information collection
- Title
- Lab assistant taking optical activity measurements with polarimeter
- Date(s)
- 1945
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator), Pix, Inc. (photographer)
- Description
-
By measuring the angle through which a beam of plane polarized light is rotated, the polarimeter saves a great amount of time in analytical procedures. In this picture, a laboratory assistant records results of test on the polarimeter at the Experimental Station.
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4464
- Collection
- DuPont Company product information collection
- Title
- Conducting synthetic textile research at the E.I. du Pont de Nemours & Company Experimental Station
- Date(s)
- 1941
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator), Rittase, William R. (photographer)
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4420
- Collection
- DuPont Company product information collection
- Title
- Conducting research at the Experimental Station
- Date(s)
- 1948
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4466
- Collection
- DuPont Company product information collection
- Title
- Research laboratory at the Experimental Station
- Date(s)
- 1935-11-04
- Contributor(s)
- E.I. du Pont de Nemours & Company (originator)
- Collection ID
- DuPont Company Product Information photographs (Accession 1972.341)
- Hagley ID
- 1972341_4467
- Collection
- DuPont Company product information collection