Magnetometer 25/1-0-1 Gauss Handheld king charles III Devonport 1:7 500

Devonport 1:7 500

Weems & Plath chart correction template #9998

Alotau 1:5 000

This eclectic collection will not disappoint any armchair seafarer

Magnetometer 25/1-0-1 Gauss Handheld king charles III Devonport 1:7 500POCKET MAGNETOMETERS DUAL PURPOSE, TWO COLOR SCALE makes the Model 25 Magnetometer more useful. The upper Black scale (the one more usually used) reads directly in gauss of a uniform magnetic field oriented parallel with the centerline of the instrument scale. The lower Red scale is used in determining the magnitude and direction of an unknown magnetic field by merely orienting the instrument for maximum reading. When shown in the Red scale, at such a