Test, visual acuity

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Ingenium, 2002.0558.001
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OBJECT TYPE
ILLUMINATED/ELECTRIC
DATE
1928–1950
ARTIFACT NUMBER
2002.0558.001
MANUFACTURER
Unknown
MODEL
Unknown
LOCATION
Unknown

More Information


General Information

Serial #
N/A
Part Number
1
Total Parts
1
AKA
vision test lantern
Patents
N/A
General Description
wood (possibly including cork); metal (including brass) glass, synthetic, paper and fibre components.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
45.0 cm
Width
45.0 cm
Height
70.5 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Medical Technology
Category
Medical equipment
Sub-Category
N/A

Manufacturer

AKA
Unknown
Country
Unknown
State/Province
Unknown
City
Unknown

Context

Country
Unknown
State/Province
Unknown
Period
Probably used c. late 1920s-1940s.
Canada
Part of a large collection of medical artifacts, archival material & trade literature transferred to CSTM in 2002, from the former History of Medicine Museum in Toronto, Ont.
Function
Freestanding, rotating illuminated eye chart used to measure quality of sight at various distances.
Technical
Portable, free-standing visual acuity test "chart" arranged on 6-sided rotating drum. Chart includes elements of Snellen, Tumbling E and Landolt C charts, as well as pictorial symbols [frequently used for testing young children and illiterate/non-English reading adults.]
Area Notes
Unknown

Details

Markings
" [diagram]/ TO CHANGE LAMP/ Remove this face./ Take wires from/ binding posts A A./ Remove thumb-/ screw B and draw/ housing from shelf./ Remove thumb-screws C and pull/ lamp from housing./ Replace with spare lamp from top/ shelf and disconnect burned-out lamp." printed on paper card mounted inside opening in one of 6 panels [sides] in unit. Each panel marked "A" through "F" in upper left corner, above "1". Each panel displays 4 viewing areas: largest at top; 2 of roughly equal size in meid-scection, and single frame with picture symbols at bottom. UHN catalogue no. "989.5.6" printed by hand in white ink on one panel of base. "22" printed by hand in blue grease on one side of exch of 6 shutters. One panel also bears illegible handwritten text, in blue grease pencil. Unbleached paper label fixed to inside of electrical compartment door in base bears 2 diagrams and text: "[illegible] plug is to be inserted in 110v./ [illegible] provided at the base of/ hexagon [illegible]. This outlet is controlled/ by the wall-switch at the operator's table./ The voltage regulator supplied 6v./ which is diminished in steps by fixed/ resistances./ When the demonstration switch (D) is/ on [up] and the lead-wire is disconnected/ from all binding posts, turning on the/ main switch at the operator's table lights/ both upper and lower panels at level 22./ When demonstration swith is off (down)/ and lead-wire is tightened under binding-/ post No. 1, turning on main switch lights/ the bottom panel at level 10. / Tightening the lead-wire under the/ other binding-posts enables operator to/ switch on other panels and other levels/ as indicated in drawing at right./ M.G. 22". Paper tag tied inside cabinet bears handwritten text: reads" This potentiometer controls/ the brightness of all panels./ The voltage accross the lamps/ is determined by the wire/ which is calmpd in the/ binding post. To increase/ brightness, replace the wire/ by the colour which comes after it in the following sequence/ Brown. Black. Yellow. White. Red."
Missing
Appears complete (save minor fittings).
Finish
Matt black painted wooden stand and 6-sided tower; matt black painted metal shutters for viewing screens; white pained metal & glass (?) screens bear black text/graphics; black moulded synthetic knobs on tower top; light brown fabric covered cord & darker brown synthetic plug cover; black and red synthetic electrical connection posts and indicator lights. Cork(?) pads line panel identification covers. Interior: light and dark-brown woven fabric, silver metal, brown and balck synthetic components. Unbleached paper labels & tag. Brass hinges & clasp.
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Unknown Manufacturer, Test, visual acuity, circa 1928–1950, Artifact no. 2002.0558, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2002.0558.001/

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