Serviss, Garrett Putman, 1851- [from old catalog] · New York, London, D. Appleton and company · leaf 16
t gives a perfectlyround field. Some glasses have an arrangement for adjust-ing the distance between the barrels to suit the eyes of dif-ferent persons, and it would be well if all were made adjust-able in the same way. Dont buy a cheap glass, but dont waste your money onfancy mountings. What the… … A very Bad Field. 6 ASTRONOMY WITH AN OPERA-GLASS. strument, may generally be regarded as a guarantee of excel-lence. Bnt the best test is that of actual performance. Ihave a field-glass which I found in a pawn-shop, that has nomakers name upon it, but in some respects is quite capableof bearing…
Astronomy
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