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. Bowl-An original treacle compass. Outer: Copper with brass rim. Brass verge ring with stud and pin at centre of glass. Brass moveable ring holding two azimuth sights. Weighted at base with lead. Inner:Copper with brass rim. Black lubber line painted on
1850
National Maritime Museum

. Bowl-Copper with top and bottom brass verge rings. Verge glass at top and bottom and suspended in ACO stand. Lead ring on inside of bowl. Black pencilled lubber lines. Card-Silk, stretched on copper hoops. Black with white markings graduated to 1/4 poin
1850
National Maritime Museum

. Bowl-Skeleton brass bowl lined with glass. Heavily weighted at base. Black lubber line on inside of bowl. Set in brass gimbal ring. Milled verge ring. Card- Mica covered with paper. Black with white markings graduated to 1/4 points. Has inner graduation
1850
National Maritime Museum

. Wooden square dry card compass stand
1850
National Maritime Museum