hand-held Becquerel phosphoroscope
Date1860-1880
Inventory Number1997-1-1527
ClassificationPhosphoroscope
Subject
Maker
Louis Jules Duboscq
French, 1817 - 1886
Cultural Region
Place of Origin
Dimensions13 x 17 x 15 cm (5 1/8 x 6 11/16 x 5 7/8 in.)
box: 15.2 × 21 × 19.1 cm (6 × 8 1/4 × 7 1/2 in.)
box: 15.2 × 21 × 19.1 cm (6 × 8 1/4 × 7 1/2 in.)
Material
DescriptionThe phosphoroscope consists of a round metal chamber with a pair of rotating disks inside, arranged so that no light can pass directly through the chamber. The disks have cut-out windows spaced equally at regular angular distances and are turned by the hand crank linked to a gear mechanism. The sample is placed in a specially designed holder into the small opening near the gearing, and it is exposed to the light source through the large rear condensing lens (missing, but similar to 2007-1-0070). The sample is then viewed through the front aperture. By varying the speed of shutter rotation, the duration of the afterglow can be determined. There is still a phosphorescent sample in the glass holder.
In Collection(s)
Signedon chamber, script: J. Duboscq à Paris
Inscribedon chamber, script: Phosphoroscope de E. Becquerel
FunctionThe phosphoroscope was invented by Alexander Edmond Becquerel (1820-1891) in 1859 and was used to measure the amount of time that a phosphorescent substance would glow after being irradiated by a brilliant source of light.
For more information on this type of apparatus, see the description of Adolphe Ganot on Google Books at the following website.
For more information on this type of apparatus, see the description of Adolphe Ganot on Google Books at the following website.
French
Date: 1860-1890
Object number: 2007-1-0070
Zeiss-Aerotopograph
Date: circa 1950
Accessories: in wooden storage case with metal handles; documentation booklet is now kept in the instrument's file; all other accessories are kept in the box and are included in the description.
Object number: 2009-1-0002b
H. Sumner
Date: circa 1903
Accessories: wooden disks (41); steel and brass fittings; wooden box for storing accessories
Object number: WJ0112
J. Duboscq-Soleil
Date: 1850
Object number: 2008-1-0098
American
Date: 1875-1925
Object number: 1998-1-0466
Andrew Pritchard
Date: 1835-1840
Accessories: objectives (4); oculars (6); lieberkühns (4); stage forceps; bull's eye condenser on stand; spring stage; extra mechanical stage; polarizer; cup diaphragms and holders; substage fork mount; live box; glass troughs (2); concave glass; fish tube holder; case; 2 keys. See also slide micrometers (2) (1088b,c)
Object number: 1088a
See also/See also
