. Scientific American Volume 24 Number 05 (January 1871) . periment-ing towards that end,I have found that a so-lution of one grain ofpermanganate of potas-sa in 3,000 grms. ofsulphuric acid, is, parexcellence, the test forthat purpose. The author gives, fur-ther, a lengthy accountof a series of experi-ments, instituted withvarious reagents,f or thepurpose of testing thedelicacy of each of thesefor the detection ofstrychnia, the resultbeing that the limit ofpositive recognition, bythe bichromate of po-tassa and sulphuric acidtest, may be placed at l-100,000th,thatof the chromic acid testat l-6
. Scientific American Volume 24 Number 05 (January 1871) . periment-ing towards that end,I have found that a so-lution of one grain ofpermanganate of potas-sa in 3,000 grms. ofsulphuric acid, is, parexcellence, the test forthat purpose. The author gives, fur-ther, a lengthy accountof a series of experi-ments, instituted withvarious reagents,f or thepurpose of testing thedelicacy of each of thesefor the detection ofstrychnia, the resultbeing that the limit ofpositive recognition, bythe bichromate of po-tassa and sulphuric acidtest, may be placed at l-100,000th,thatof the chromic acid testat l-600,000th, and that of the permanganate at l-900,000th. Asregards the use of the permanganate, the author distinctlystates that the honor of its discovery belongs to Dr. Wm. A. Guy, of London. ■««»■■ IMPEOVED GATE. Swinging gates are not only liable to sag on their hinges,and render them difficult to latch and unlatch, but they arealso often impeded by snow. The gate shown in the accom-panying engraving is constructed on the lazy tongs principle,. and opening endwise on pivoted bars attached to the gate-post, is not interfered with by sagging, or by accumulationsof snow. It is the invention of J. R. Breese, of MiddletownN. Y.
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Keywords: ., bookdecade1870, booksubjectmachinery, booksubjectperpetualmotion
