. The American journal of science and arts. * I commenced my experiments on this instrument in Feb. 1832. I presently-had one constructed for myself by a very ingenious young artisan of this city Mr. Another has been constructed under my direction by Mr. Cox, for Mr. Bon-ney. 238 The Microscopic Compass. of brass, three inches in diameter and very light, weighing fifty the word card is inappropriate, yet as it has been coin-ed by use for that part of a compass when it moves with the needle,I shall use it in the subsequent part of this paper. Fig. Fig. 3.

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Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820