Four Objectives in Cans and Four Lieberkuhns, by Powell & Lealand, London, 1864

Four copper alloy objectives of the following powers: 1 1/2 inch, 2/3 inch, 1/2 inch, 1/4 inch. Two of the objectives are fitted with graded correction collars and engraved with the name of their manufacturer. All four objectives are engraved with "M.S.L" (Microscopical Society of London). Each objective is stored in a can with a threaded lid, each lid is engraved with the power of the objective. Four Lieberkühn are present, one of which fits the 2/3" objective, one fits the 1 1/2" objective, the remaining two do not fit either of the highest power objectives. Each Lieberkühn has a removable dust cap.