Some specimens of caoutchouc are harder than gutta percha itself, and equally inelastic, whilst others never perfectly solidify, but remain in a condition resembling that of birdlime or printers' varnish.
After several hours the gutta percha is found to be kneaded into a perfectly homogeneous mass, which is rolled or drawn into sheets, bands, or tubes, as required.
At the International Exhibition of 1862 the Gutta Percha Company exhibited one mile of covered wire perfectly insulated, which was hardly thicker than common sewing cotton.
Gutta percha and vulcanised india rubber are now applied to many of the purposes formerly exclusively occupied by catgut.
Gutta percha is a tough, inelastic substance, becoming soft and plastic at 212 deg.
Gutta percha may be rolled into thin transparent sheets, which, being perfectly impervious to moisture, are well adapted for surgical purposes.
The raw material is dissolved in a certain solvent, and the solution most carefully filtered until it leaves on evaporation the gutta percha in a pure milk-white condition.
Dr Cattell, of London, has succeeded in purifying gutta percha so perfectly from all extraneous matter, that it presents the appearance of ivory.
Gutta-percha catheters (hollow bougies) are still more flexible and easily introduced, and may remain in the urethra for a long time without causing irritation; an important advantage in such matters.
A few days after, a combination was formed to carry on the whole business of making Submarine Telegraphs, by a union of the Gutta-Percha Company with the firm of Glass, Elliot & Co.
India-rubber and gutta-percha goods, including waterproof clothing made wholly or in part thereof.
Rubber and gutta-percha and manufactures thereof, alone or mixed with other substances (except silk), and oilcloths and tarpaulin.
The gutta-percha is inodorous, cheap, and can be renewed as often as required.
Maps, charts, or engravings may be effectually varnished by brushing a very delicate coating of gutta-percha solution over their surface.
The gutta percha should be twisted round the wire previously warmed, and gently heated over a spirit lamp, or dipped again into hot water, so as to allow the various parts to be covered with it.
And in the companion folder of this case Of gutta percha Is the shape of a man.
The clasp on this guttapercha case Locks them together.
For the secret of these human beings Locked in this gutta percha case Is the secret of Mephistos and red Campions.
In these, as the gutta-percha is apt to crack, india-rubber as the inner coating is preferable.
A piece of gutta-percha should then be taken and placed upon the joint while warm, and with the aid of the spirit lamp and wet fingers, moulded round until a firm and perfect covering has been formed.
The reason for selecting this kind is, that with the gutta-percha wires the joints may be more perfectly covered and made secure against damp.
A number of wires may be twisted into a cable, and run through a short piece of gutta-percha tube, and fastened with ordinary gas hooks where it is an advantage to do so.
Nothing toward using the treasures of gutta- perchawhich are now wasting in the Balatas?
He talks of a time when the English gutta-percha market shall be supplied from the Balatas of the northern hills, which cannot be shipped away as timber.
The vessel to which the air and water are conveyed by a gutta-percha tube, T.
Leyden jar coated with tinfoil, and standing on any non-conductor, such as gutta percha or the resinous or glass plate, C.
The water-tight gutta-percha shell, containing the message or information.
Glass or gutta-percha bath to hold the sensitizing solution.
And here are the two bits of gutta-percha tubing to make into syphons.
I will send a small case to you, containing some early specimens and gutta-percha negatives, with a copy of Mr. A.
The sheet can also be used on the ground, and is a great protection from dampness, and as a shawl or talma; indeed, a variety of advantageous uses to which the gutta-percha sheet may be put will suggest themselves to persons using it.
When used as a knapsack, the clothing is packed in a cotton bag, and the gutta-percha sheet is folded round it, lapping at the ends.
The Board is satisfied with its merits in all the uses to which it is proposed to be put, and is of opinion that the gutta-percha tent knapsack may be adopted in the military service with advantage.
Sugar may be well secured in India-rubber or gutta-percha sacks, or so placed in the wagon as not to risk getting wet.
The bedding for each person should consist of two blankets, a comforter, and a pillow, and a gutta percha or painted canvas cloth to spread beneath the bed upon the ground, and to contain it when rolled up for transportation.
I mention this case partly for the purpose of calling the attention of the members of the society to the use of gutta percha as a material for splints.
I suggested the use of a gutta percha mould or covering for the knee.
After five or six days a gutta percha splint was used which encircled the arm.
Well pressed down with this pad the gutta-percha will stick to the leather, and also cause it to keep in place on the groundwork, to which it is made to adhere permanently by passing a hot iron over the surface.
In the latter case the back of the leather is made quite smooth, and a layer of gutta-percha is placed on it and made to stick by means of steam produced by heating a wet pad.
Let us rub a strip of writing paper with Indian rubber, or a strip of Gutta Percha with the fingers, in the dark, and we have the manifestation of several curious phenomena.
On the use of Gutta Percha in Electrical Insulation: by Dr.
Dissolve the gutta percha in the bisulphide of carbon, the asphalte and amber in the oil, and mix well.
Flexible or elastic moulds may be made of gutta percha softened in boiling water, and after being freed from moisture, pressed strongly against the object to be copied by means of a screw press.
This article, as manufactured by the Gutta Percha Company, is simply a solution of white and dry unmanufactured gutta percha in bisulphuret of carbon.
Pure guttapercha may be substituted for india rubber.
Others have recommended for this purpose a solution of gutta percha in either chloroform or bisulphide of carbon.
In the middle of this tray a developing stand of gutta percha is fixed to the bottom, on which to lay the glass plates.
The electric condition of the cable was continually tested during the ship's voyage across the Atlantic; and more than once its efficiency was disturbed by fragments of wire piercing the gutta percha and destroying the insulation.
Gutta-percha when exposed to air becomes hardened and will crack, but under water it seems to be practically indestructible.
It was not until gutta-percha began to be used as an insulator for submarine lines that any substantial progress was made.
The sediment removed, the degorgeur slips a temporary cork into the bottle, or places the latter in a machine provided with fixed gutta-percha corks and springs for securing the bottles firmly in their places.
The must filters through a wicker basket into the reservoir beneath, whence, after remaining a certain time to allow of its ridding itself of the grosser lees, it is pumped through a gutta-percha tube into the casks.
Formerly, to prevent the carbonic acid gas escaping from the bottles while the process of liqueuring was going on, it was necessary to press a gutta-percha ball connected with the machine, in order to force the escaping gas back.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "percha" in a variety of sentences. We hope that you will now be able to make sentences using this word.
