The fragment should be carefully supported by winding some thin platinum wire round it, as, if the wire is too thick, it cools down the heat of the bit of diamond and prevents it kindling in the oxygen gas.
A piece of black lead (so called) may now be taken from a lead pencil and also supported by platinum wire; likewise a bit of common bark charcoal or hard coke.
Each tube has a platinum wire inserted at both ends, with which the contact is made with the coil.
At an early part of this lecture it was affirmed, that when a platinum wire was, gradually raised to a state of high incandescence, new rays were constantly added, while the intensity of the old ones was increased.
The source of heat throughout these comparative experiments consisted of a platinum wire, raised to incandescence by an electric current of unvarying strength.
In the experiment just described we began with a platinum wire at an ordinary temperature, and gradually raised it to a white heat.
A platinum wire, extending along their whole length, is introduced into the other end of each tube, and this end is then fused up round the wire, the end of which protrudes outside the tube.
Platinum wire requires to be heated, but platinum in so finely divided a state as it occurs in this ash inflames hydrogen, even at -20°.
For this purpose the flint-glass tube is pulled down till it will just slip over the stem and wire, and is cut off so as to leave about half a centimetre of platinum wire projecting.
The platinum wires may be most conveniently attached by melting one end of the piece of platinum wire in the oxygas blow-pipe till it forms a bead just large enough to pass into the hole drilled up the stem of the electrode.
The tube is fastened to a thermometer by means of platinum wire, and then the bulb of the thermometer, with its attached tube, is immersed in strong sulphuric acid or paraffin, contained in a flask.
In the improved form of this light the lime is protected from crumbling by a cage of platinum wire, and is caused to rotate slowly by means of clockwork, so as constantly to expose a fresh surface to the flame.
It is remarkable for the magnificent blue colour it communicates to glass, and by this character its presence may be readily detected before the blowpipe; the substance to be examined being fused with borax on a loop of platinum wire.
We have already seen that it must be in quantity sufficient to sustain a platinum wire 1/104 of an inch in thickness, red hot, in contact with the air, for three minutes and three quarters.
Another form of platinum wire fuze, which has been devised by Captain McEvoy, formerly of the Confederate Service, is shown at Fig.
There are numerous advantages accruing from the use of platinum wire fuzes, the chief of which are here enumerated:-- a.
Platinum wire requires a temperature of some 500 deg.
This system is dependent on the use of a platinum wire fuze in connection with a platinum wire bridge in each branch close to its junction with the main cable.
In flame on platinum wire With borax bead on platinum wire.
Or a small piece of the dry salt, fused upon a platinum wire, must give a clear and uncolored glass, as well in the oxidation flame as in the reduction flame.
For the purpose of acquiring practice, the following may be done: Melt a little molybdenic acid with some borax, upon a platinum wire, about the sixteenth of an inch from the point of the blue cone.
A small piece of pumice stone was stuck on a platinum wire, and first melted to it in a gas burner.
T1, sealed to another long tube T, is provided with a stem s, with a platinum wire sealed in the latter.
A bulb, preferably a large one, may be taken, and a good conducting body, such as a piece of carbon, may be mounted in it upon a platinum wire sealed in the glass stem.
A spiral of platinum wire is employed as the anode, from which the silver may be dissolved by means of nitric acid, and tested for by hydrochloric acid or by sulphureted hydrogen.
Mercury is best separated from its nitric acid solution on a small closely wound spiral of platinum wire.
A spiral of platinum wire is employed as the cathode, and the presence of the metal confirmed for by dissolving it in a little nitric acid, diluting with water and adding potassium ferrocyanide.
The point of the screw has now to be cut off and a very small piece of platinum wire fixed at the end.
The screw of the paper fastener must now be tipped with platinum by cutting off the end and drilling a fine hole in it, in which hole a small piece of platinum wire can be soldered.
It was likewise possible to maintain a filament or button mounted in a tube at bright incandescence, and, in one experiment, a mica vane was spun by the incandescence of a platinum wire.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "platinum wire" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
