DE82818C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 32: Glass.

ALFRED ROST in HALB CITY (Bohemia).

Patented in the German Empire on January 21, 1894.

In further attempts to manufacture transparent mirrors and daylight reflectors , as well as described in patent no. 77725, it has been found that also using the known Silver nitrate coating, transparent mirrors and daylight reflectors can be obtained, if the occupancy is interrupted at the appropriate moment and the mirrors then accordingly further treated in the manner indicated in the said patents.

The method of creating clear mirrors using the Silver nitrate coating is the following:

The covering is composed of the following liquids:

1. from the actual coating liquid by adding 1 part by weight of silver nitrate to Dissolves 10 parts by weight of distilled water,

2. from the neutralizing liquid, just like I., only in a smaller amount.

The solution is added 1. with constant stirring, finally dropwise with ammonia, until the initially formed precipitate has dissolved again and the liquid appears clear.

Since excess ammonia is necessary for this purpose, however, this later becomes disruptive would work, the neutralizing liquid is added carefully until the smell of the ammonia disappeared again and the liquid became very cloudy again is.

This is based on 1 part by weight of the silver nitrate taken for solution 1 100 parts by weight of distilled water are added and filtered until the liquid appears quite clear, whereupon it is ready for use.

3. The reducing liquid is produced by adding 0.8 parts by weight of Seignette salt Boil 384 parts by weight of distilled water and gradually add it to this boiling solution distilled a solution of 3 parts by weight of nitric acid silver in 10 parts by weight Adding water.

As soon as the whole thing has cooled down, this liquid too is filtered.

The covering itself should be done at a temperature of approx. 25 ° C. and so should the liquids have approximately this temperature.

To produce the topping, mix equal volumes of the above-mentioned topping and reducing liquid (to be conveyed by stirring or shaking) and pours them Mix on the horizontally placed, carefully cleaned glass plate, or immerse this accordingly in the above liquid.

While now in the production of the usual, previously known and used, opaque · mirror was sought, as much silver as possible, so one as possible to deposit a thick layer of silver, and for this purpose the infusion in and out had to be renewed twice, the precipitate is used to produce transparent mirrors punctually interrupted by pouring the coating liquid or lifting the glass plate from the same and 'the coating with washed over with pure distilled water.

(2nd edition, issued February 22, 1904.)

In the beginning, before experience shows that the correct time for the duration of the low ^ Blow or for the moment of the interruption of the same, one has on a sheet of white paper underneath an approximate measure of the degree of Transparency.

The main thing, of course, is that the surface is as clear as possible, not too dark in color and yet dense enough to make a mirror that is as beautiful and good as possible to generate, while still ■ allowing light to pass through and allowing it to be viewed from behind, so to be transparent.

As soon as the fresh mirror covering is rinsed off with distilled water, the mirror becomes set up vertically to dry and, when completely dry, cover the side with a Poured over good, colorless varnish or dipped in such a bath and then again carefully dried and finally with a

correspondingly thick, 'transparent glass plate covered and framed, if possible also cemented so that no dust can get in between.

Claims (1)

Patent claim: Method of making clear mirrors and daylight reflectors using of the well-known silver nitrate coating, consisting in the fact that the precipitate is deposited by pouring off the coating liquid or by lifting it off the glass plate interrupted from the same, or the coating liquid in such a way is diluted so that no more silver can reach the excretion than to achieve the desired transparency it is necessary that the covering is also washed with distilled water, dried, then coated with fine, colorless varnish and covered with a glass plate after drying.