G-4 Obstacle Detector

Detector, Obstacle

Accession Number: 2007.33.7

Description: Brown Bakelite case; handle on top behind top of case, roughly parallel to case; window in front with two stacked fresnel lenses, top lens has a rounded top and is slightly smaller than the lower rectangular lens; mini-jack for testing on back of case, sliding on/off toggle on top of case below handle; clear plastic activation button on top of handle, output "needle" on bottom of handle, almost at its base; jack for recharging on base, adhesive label there reads "Do NOT use a G-5 Charger!!"; rectangular hatch secured with screw on left side.

Height: 7.625

Width: 2.75

Depth: 6.75

Date Made: ca. 1953

Place of Origin: Haverford, PA

Collection: AER O&M Division C. Warren Bledsoe Archives

History/Provenance: AER O&M Division C. Warren Bledsoe Archives

Credit Line: Gift of Association for Education and Rehabilitation of the Blind and Visually Impaired

Subjects: Orientation & Mobility Electronic Travel Aids

Dimension Notes: overall

Made: Biophysical Instruments, Inc.; Benham, Thomas A.

Material: Bakelite, plastic, glass, brass, aluminum

Updated: 08/30/2017