cumulative recorder for student projects
Date: circa 1960
Inventory Number: 1999-1-0056
Classification: Cumulative Recorder
Subject:
Manufacturer: Ralph Gerbrands Company (1930 - 1994)
Cultural Region:
Place of Origin:
Dimensions:
without cord: 14 × 31.8 × 42.7 cm (5 1/2 × 12 1/2 × 16 13/16 in.)
Material:
Description:
A plexiglass clipboard is used as a base, supported by three rubber circular feet. Two endless screws move the glass pen (missing) in both plane coordinates of the paper sheet. The motor moves along the horizontal axis, while the pen moves independently along the vertical axis. This instrument was simply plugged onto a wall. Six switches were used to calibrate and adjust the instrument.
Signedon motor: Ralph Gerbrands Company / 8 BECK ROAD / ARLINGTON, MA 02174 U.S.A.
FunctionTo record operant responses in a Skinnerian conditioning experiment.
ProvenanceProfessor John Michael Harrison, Department of Psychology, Boston University, pre-1998; gift to CHSI, 1999.