Prism with double mirror and blue-tinted glass housed in a conical piece of brass. Bubble level. Pressure fitting cover. Needle broken. Original wooden box with key. Red felt protective patches. Two removable wooden inserts for securing instrument in box. To aid in removal of instrument from its case, a pierced arch of black-painted brass is attached to base; one replacement screw.
Materiale
"E. I. DENTOS / PATENT / MERIDIAN INSTRUMENT / 82, Strand, / & 33, Cockspur St. / LONDON" on cover.
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