Accession Number:

AD0613612

Title:

A STATIC INVESTIGATION OF SELECTED SCALE CHARACTERISTICS FOR MOVING-TAPE INSTRUMENTS,

Descriptive Note:

Corporate Author:

BUNKER-RAMO CORP CANOGA PARK CALIF

Personal Author(s):

Report Date:

1964-10-01

Pagination or Media Count:

57.0

Abstract:

An experiment was conducted to investigate the effects of scale factors, graduation marks, orientation of scales and factors of 10 reading conditions on moving-tape instruments. Subjects consisted of 150 Air Force officers. A five dimensional partial hierachal model was employed with subjects nesting within graduation mark-factors of 10 combinations. Each subject made a total of 150 self-paced readings from slides of hand drawn instrument-like scales with a fixed read line indicator. Legibility was determined in terms of subjects speed and accuracy in reading the scales. Error was expressed as the magnitude of deviation of a subjects verbal response from the set scale value. An analysis of variance was performed on the mean error scores, standard deviations of error, mean reaction times, and standard deviations of reaction times. Where significant differences were noted, the nature of these differences was examined by the Newman-Keuls method. The results clearly favored the 1-78 inch scale factor over the 1-38 inch and the 2-38 inch scale factor. The use of 9 graduation marks was superior to either 0, 1, 3 or 4 graduation scales read by 10 or by 1000. Horizontal scales were read more rapidly but no more accurately than vertical scales. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE