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In order not to multiply the solutions, take the ordinary chloride of gold, used for fixing the impressions, and which is composed of 1 gramme of chloride of gold and 50 grains of hyposulphate of soda, to a quart of distilled water. With respect to chloride of platinum, 4 grains must be dissolved in 3 quarts of distilled water; these two solutions are mixed in equal quantities. Acids.
We employed a current which corresponded to an evolution of 330 c.c. of gas per hour, and we were able to precipitate 0.15 gramme metallic copper in about twenty-five minutes.
In this case the magnetic rotations are produced in an electro magnet by means of alternate currents supplied by alternating Gramme machine. In order to better explain the action, it will be necessary to refer to a new electro-motor, which was the subject of an article in the Electrical Review of February 19 last.
In order to obviate this difficulty, the solution to which the ammonium oxalate had been added in excess is heated, and then three or four grammes more of solid ammonium oxalate are added. The hot solution, when exposed to the action of the current, deposits the cobalt as a closely adhering gray film. By the aid of two Bunsen's elements, 0.2 gramme cobalt can be separated in an hour's time.
"In the first series of experiments, the daily allowance of food, though less copious on the tea days, was more nitrogenized, and nitrogen also was taken in as theine. Yet, in spite of this, the quantity thrown off in twenty-four hours was nearly a gramme less than on the water days.
It was this tremendous feeling of joy, and not by any means his complex and variegated worries, that might have prevented him from obtaining the sleep which Nature demanded. On reaching the dome at 2 a.m., he had taken four tabloids, each containing 0·324 gramme of trional, and had drunk the glass of hot milk which Simon always left him in case he should want it.
But this feeble current exalts the strength of the field-magnets, producing a stronger field, which in turn excites a still stronger current in the armature, and this process of give and take goes on until the full strength or "saturation" of the magnets is attained. Such is the "series" dynamo, of which the well-known Gramme machine is a type.
F. It also melts in boiling water, and its aqueous solution exposed to the light is partially reduced, 100 grammes of water acidulated with 10 cubic centimeters of 1.190 deg. solution of hydrochloric acid dissolves 0.137 gramme of the gold salt at 136 deg. F. to 140 deg.
Since 1851 a new commercial cement had come into operation in the adoption by neighboring powers of the French metrical system. England and America still hold out against the metre and the gramme; and the press of both occasionally levels at it the old jokes of making the spheres weigh a pound of butter and the polar axis measure a yard of calico.
The unit adopted for square measure was the are, equal to 100 square meters; for solid measure, the stère, equal to one cubic meter; and for measure of capacity, the litre, a cubic decimeter. The weights were derived from these measures; the gramme being the weight of one cubic centimeter of distilled water.
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