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. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. Needle- Four very light edge bar needles, composed of one very thin strip of steel, 2 x 7" and 2 x 5" long, and 0.5" dee
1885
National Maritime Museum

. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. Needle- Six light edge bar needles composed of one thin strip of steel with the ends bevelled of sharply, 2 x 7", 2 x 5.25"
1885
National Maritime Museum

. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. Needle- Four very light edge bar needles, composed of one thin strip of steel, 2 x 7.25" and 2 x 5.25" long, and 0.25"
1885
National Maritime Museum

. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. At centre of card is 3" dia. hole. Needle- Four light edge bar needles composed of one thin strip of steel, 2 x 7.25" and 2 x
1885
National Maritime Museum

. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. At centre of card is a hole 3" in dia. Needle- Four light edge bar needles, composed of one thin strip of steel, 2 x 7.25"
1885
National Maritime Museum

. Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees. At centre of card is a hole 3" in dia. Needle- Four light edge bar needles, composed of one thin strip of steel, 2 x 7.25"
1885
National Maritime Museum