WorldCat Identities

Howett, Gerald Leonard 1931-

Overview
Works: 23 works in 47 publications in 1 language and 778 library holdings
Roles: Author
Classifications: QC100, 629.271
Publication Timeline
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Most widely held works by Gerald Leonard Howett
Emergency vehicle warning lights : state of the art by Gerald Leonard Howett( Book )

7 editions published in 1978 in English and held by 189 WorldCat member libraries worldwide

Some psychophysical tests of the conspicuities of emergency vehicle warning lights by Gerald Leonard Howett( Book )

3 editions published in 1979 in English and held by 173 WorldCat member libraries worldwide

Emergency vehicle warning systems by Arthur I Rubin( Book )

6 editions published in 1981 in English and held by 158 WorldCat member libraries worldwide

Size of letters required for visibility as a function of viewing distance and observer visual acuity by Gerald Leonard Howett( Book )

4 editions published in 1983 in English and held by 113 WorldCat member libraries worldwide

Safety color appearance under selected light sources by Belinda Lowenhaupt Collins( )

1 edition published in 1986 in English and held by 54 WorldCat member libraries worldwide

Linear opponent-colors model optimized for brightness prediction by Gerald Leonard Howett( )

2 editions published in 1986 in English and held by 54 WorldCat member libraries worldwide

Some psychophysical tests of the conspicuities of emergency vehicle warning lights by Gerald Leonard Howett( )

3 editions published in 1979 in English and held by 9 WorldCat member libraries worldwide

Some psychophysical tests of the conspicuities of emergency vehicle warning lights by Gerald Leonard Howett( Book )

1 edition published in 1979 in English and held by 3 WorldCat member libraries worldwide

Emergency vehicle warning systems by A. I Rubin( Book )

3 editions published in 1981 in English and held by 3 WorldCat member libraries worldwide

The subject of visual and auditory warning devices (lights and sirens) for emergency and service vehicles is surveyed from a broad perspective. The report should provide directly useful information at all levels from the selection of hardware to a general understanding of the psychophysical factors determining the effectiveness of these devices. Topics covered include: an analysis of warning signals; the present situation and the need for uniform national standards; suggested performance standards for warning light systems and for sirens, including the reasons for the principal requirements; recommendations for actions that can be taken to improve the signal effectiveness of emergency vehicles; and brief summaries of some of the physical measurements that are made on a selection of lights and sirens
Emergency vehicle warning systems by Arthur I Rubin( Book )

1 edition published in 1981 in Undetermined and held by 3 WorldCat member libraries worldwide

Some psychophysical tests of the conspicuities of emergency vehicle warning lights by Gerald Leonard Howett( Book )

3 editions published in 1979 in English and held by 3 WorldCat member libraries worldwide

The detection of separations between adjacent signals on a simulated ppi radar scope by Robert M Herrick( Book )

1 edition published in 1955 in English and held by 3 WorldCat member libraries worldwide

A simulated Plan Position Indicator (PPI) scope was used to evaluate the effects of a number of visual variables upon the minumum signal luminance increment required for the detection of a separation between two identical signals. The signal luminance increment is the difference between the signal luminance and the scope face luminance. All of the variables, viz., background luminance, distance between signals, scan rate, and simulated phosphorescence decay were of importance in determining threshold log values. Differences in threshold log mong the observers were also statistically significant. Moreover, most of the interactions among the variables were statistically significant
Transformations of trichromatic coordinates in colorimetry by Gerald Leonard Howett( Book )

2 editions published in 1957 in English and held by 2 WorldCat member libraries worldwide

Emergency vehicle warning lights by Gerald Leonard Howett( Book )

1 edition published in 1978 in Undetermined and held by 2 WorldCat member libraries worldwide

Size of Letters Required for Visibility as a Function of Viewing Distance and Observer Visual Activity by Gerald Leonard Howett( Book )

1 edition published in 1983 in English and held by 2 WorldCat member libraries worldwide

LEAA Police equipment survey of 1972 by Gerald Leonard Howett( Book )

1 edition published in 1978 in English and held by 1 WorldCat member library worldwide

Some psychophysical tests of the conspicuities of emergency vehicle warning lights by Gerald Leonard Howett( Book )

1 edition published in 1979 in English and held by 1 WorldCat member library worldwide

Legibility, esthetics, and page size by Gerald Leonard Howett( )

1 edition published in 1972 in English and held by 1 WorldCat member library worldwide

Color under energy efficient lighting( Visual )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

Examines the three major variables affecting color perception: chromatic adaptation, colorants, and the spectral energy distribution of lights. Describes the research of the National Bureau of Standards aimed at helping solve problems associated with the effects of energy-efficient lighting on color
Emergency vehicle warning lights: state of the art by Gerald Leonard Howett( Book )

1 edition published in 1978 in English and held by 1 WorldCat member library worldwide

 
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Audience Level
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  Kids General Special  
Audience level: 0.60 (from 0.29 for Transforma ... to 0.97 for Size of Le ...)

Alternative Names
Howett, Gerald Leonard 1931-

Languages
English (42)