We have seen very few positives produced by it which are permanent.
I think many amateur photographers would be thankful for plain and simple directions how to mount their positives on cardboard.
In all printing of positives it is needful to salt the paper; when albumenized paper is used it is combined with the albumen.
I'll take you to see them when the positivesare made," he said.
From it any number of positives can be made, all depending on the popularity of the subject.
And here the film negatives are developed, and duplicate positives made for the projecting machines.
Positives printed in a bright sun quickly are always better than those obtained by longer exposure without sun.
Great attention should be paid to this: for the finest tints are only to be obtained in positives exposed exactly the right time.
If the chloride of silver is omitted, the bath will do very well, but will very much improve with age, as it will acquire chloride of silver from the positives placed in it.
For portraits on porcelain or opal, to be viewed as positives by reflected light, develop until the fine half-tones in the face are visible.
The solvent most generally used for fixing or clearing positives is cyanide of potassium.
Slow gelatino bromide plates, such as Carbutt makes for this purpose, produce very satisfactory work, but the chlorides are so far superior that there can be little doubt of their being exclusively employed for positives in future.
The first positives on glass were called ambrotypes, and were the successors to the daguerreotype, which they superseded and displaced by the superior facility of their production.
But instead of coloured glasses being used to give effect to the positives the positives themselves are dyed, and placed one on the top of another in close contact, so that the light from the lantern passes through them in succession.
Having secured his negatives he printed off transparent positives on glass, and arranged these last round the circumference of a large disc rotating in front of a screen, having in it a hole the size of the transparencies.
The most ingenious part of Mr. Ives' method is the apparatus for presenting all threepositives (lighted through their coloured glasses) to the eye simultaneously.
The result is that, though in the positives there is at first no colour, patches of gelatine are left which will absorb dyes of various colours.
The positives are therefore dyed, not in the same colours as the screens used when the negatives were made, but in their complementary colours, i.
The positives made from these were illuminated in turn by flashes of electric light.
Now if the other positives were dyed green and violet, what would happen?
The three blocks have applied to them ink of a complementary colour to the screen they represent, just as in the Sanger Shepherd process the positives were dyed.
As in the Ives process, three negatives and three transparent positives are made.
Similarly with the green and violet positives if viewed through glasses of proper colour.
Thus, as red in this particular case is wanted it will be attained by the other two positives (which are placed in contact with the red positive, so that all three coincide exactly), robbing white light of all but its red rays.
The Kromoscope, as the viewing apparatus is termed, contains three mirrors, projecting the reflections from the positivesin a single line.
If the flower-pot had been white all three positives would have contained clear patches unaffected by the three dyes, and the white light would have been unobstructed.
Positives are printed by the carbon process on thin celluloid films.
I have not had an opportunity of trying this for negatives, but I have taken some good positives with the paper so prepared.
LYTE, you certainly obtain the sweetest-toned positiveshe has ever seen.
From these he made glass positives and projected them on a screen in rapid succession so that the picture appeared to move.
Glass positives of these pictures were thrown on the screen by means of a machine to which he gave the formidable name “zoöpraxiscope.
The terminals of these groups of batteries are connected respectively to the four rollers which impinge upon the transmitting drum, the negatives being connected to 5 and 7, and the positives to 6 and 8, as denoted by the letters N and P.
Three sets of each of these positives were made, and all put into separate test tubes with a uniform type of negative element.
At the end of the scene the negative is developed in the ordinary way, and is then ready for use in the printing of the positives for sale.
For this and for other processes in which photographs form the originals to be reproduced, authors should send the negative to the collotyper; if this be impossible, positives of the best possible quality, printed on ordinary P.
From each negative there is made by contact a transparency, and from these positives there are prepared a set of half-tone negatives from which are made the half-tone blocks.
There are thus obtained three negatives which, of course, yield positives which look very different one from the other.
Two positives are made from the two negatives and bound in contact by means of lantern slide binders, so that the outlines coincide.
This is an epitome of the whole of Archer's process for making either negatives or positives on glass, the difference being effected by varying the time of exposure and development.
He also published his method of bleaching positives and intensifying negatives with bichloride of mercury.
Nor do I see the advantage the pictures would possess, if they did, over positives taken by our process.
The Tudor cell has positives formed of lead plates cast in one piece with a large surface of thin vertical ribs, intersected at intervals by horizontal ribs to give the plates strength to withstand buckling in both directions (fig.
Electrical Power Storage Company, are of the Faure or pasted type, but the Plante formation is used for the positives of two kinds of cell.
All the positives ought to be alike, and similarly all the negatives.
It is lawful in such cases, because positives give way to moral or natural duties, caeteris paribus, and lesser duties unto greater: the sabbath is made for man, and not man for the sabbath.
Four hours later he delivered the positives to the respective theatres, and ultimately he sold the negative outright to the firm who completed his printing contracts for the supply of other markets at their disposal.
At first there may be a tendency to make the positives somewhat too dense, and then, when the evils of this defect are appreciated, to fly to the opposite extreme.
It is a universal law of electricity that positives repel each other, and that negatives repel each other; but that positives and negatives attract each other.
These positivesbear the same relation to the negative as "prints" do to a photographic plate.
In the case of formed plates, and before the first charging, the positives are of a dark brown color with whitish or reddish gray spots, and the negatives are of a yellowish gray.
In the case of formed plates, and before the first charging, the positives are of a dark brown color with whitish or reddish gray spots and the negatives are of a yellowish gray.
I am led to propose this subject for the consideration of practical photographists, and, if possible, that amateurs may arrive at something like a rule to guide them in printing positives that will please.
Rinse the positives a number of times in a jar of clean water by moving them up and down in the water.
Remember that the capacity of negatives decreases steadily after they are put into service, while the capacity of positives increases.
The condition of the positives may also be determined if a flash light or other strong light is directed on the edges of the plates.
Because the positives warp or buckle, this causing most of the battery troubles.
If positives and negatives cannot be separated, wash each complete element in a gentle stream of water.
The positive plates are known as Manchester positives and have the active material in the form of corrugated buttons which are held in a thick grid, as shown in Fig.
It may not be necessary to separate the groups even then, provided that the positivesare not buckled to any noticeable extent.
Generally, at least, a new case, jars, and positives are required.
Positives cannot be pressed as negatives can, because the positive active material lacks the elasticity and toughness of the negative spongy lead.
Positives from frozen vehicle cell, showing active material sticking to separator] When to Put In New Plates 1.
A very little practice will suffice to show the operator the quality of glass negatives--I mean as to vigour and development--best adapted for reproducing positives by this method.
Where are the positiveswhich are here supposed to be "increased to the highest degree?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "positives" in a variety of sentences. We hope that you will now be able to make sentences using this word.
