This intrinsical constancy is indispensable

This intrinsical constancy is indispensable Post Date: Sat, 2 Aug 2008 0:34:53 +0000
But ter mination is the same as limitation. Therefore, all that is essential to the idea of extension, that is, direction and limitability, remain always the same and unchangeable. This intrinsical constancy is indispensable to science.

Autor of the post: Undefined

Blinkx Video Search
World's largest video search engine. Over 26 million hours of video.
www.blinkx.com

Watch Free Videos At Mevio!
Tons of Free Videos, Only At Mevio.com
mevio.com

Modern Day Jesus: Santa vs. Jesus
Jesus Christ! Modern day life is pretty tough for ol' J.C. - especially when he has to compete with that conceited Kris Kringle! Watch it on Atom.com
atom.com

TalentTrove: Get Discovered!
TalentTrove provides aspiring artists and performers with the opportunity to be discovered! Upload, and broadcast your skills in the form of audio and video files, images, or text. Finally, a virtual community for individuals to discuss their passions...
talenttrove.com

Ripe Tv!
Hottest Video portal on the internet. Every Kind of Video - Supermodels, Martial arts, Cool shows, Pick Miss Ripe and More
ripetv.com

Recent post:

1. - It might be imagined Post Date: Mon, 4 Aug 2008 22:47:20 +0000
For several years, the lanterns by which dissolving views, and other effects, have been produced in the public exhibitions in London, have been illuminated by the oxy-hydrogen light. This light proceeds from a ball or cylinder of lime, rendered incandescent, or white hot, by the flame of a blow pipe, from which a mixture of oxygen and hydrogen gases, in the proportion in which these gases produce water, issues. It might be imagined that the light produced by a piece of solid matter like lime, however intensely heated, could never be brilliant enough to produce a strong illumination; nevertheless, the light radiated from the lime in this case, was the most intense artificial light which had ever been produced, until the invention of another, which we shall presently notice.

Autor of the post: Undefined

2. - This method of illumination, though Post Date: Mon, 4 Aug 2008 22:57:39 +0000
In the oxy-hydrogen lanterns, the cylinder of lime is mounted so as to occupy the place of the flame of the lamp in the axis of the lenses. The flame of the blow pipe is projected upon that side of it which is presented towards the lenses, and since the lime, though it does not undergo combustion, is gradually wasted by the action of the flame, it is kept in slow revolution by clock- work, connected with the axis upon which it is supported, so as to present to the flame successively different parts of its surface. This method of illumination, though still continued, is greatly surpassed in splendour by that of the electric light, which has recently been applied to the magic lantern by M Dubosc, the successor of M Soleil, the celebrated Paris optician.

Autor of the post: Undefined

3. - 257 The wires H K Post Date: Mon, 4 Aug 2008 23:08:52 +0000
The electric light is produced by bringing two pieces of charcoal, previously put in connection with the poles of a voltaic battery, nearly into contact ; the volta current will then pass from one to the other, the ends of the charcoal thus nearly in contact becom- ing incandescent, and emitting the most brilliant artificial light which has ever yet been produced. The method of mounting this illuminating apparatus in the lantern ia shown in. 257 The wires H K, being connected with the poles of the battery, are attached to two pieces of metal, the negative wire H communicating with the upper pencil of charcoal, c, and the positive wire K with the lower charcoal pencil, a.

Autor of the post: Undefined

4. - To prevent this Post Date: Mon, 4 Aug 2008 23:24:16 +0000
The points of the pencils being nearly in contact, the light will be produced in the manner just explained. Although the charcoal does not, properly speaking, undergo combustion, it is gradually wasted, and when the points would thus become sepa- rated, the current would be suspended, and, therefore, the light would cease. To prevent this, and to maintain the illumination, an apparatus con- sisting of clockwork is provided in the case p, by which the charcoal pencil, a, is kept nearly in contact with the pencil, c.

Autor of the post: Undefined

5. - This is accomplished by placing Post Date: Mon, 4 Aug 2008 23:37:40 +0000
The clockwork is so constructed that its motion is governed by the current. M Dubosc has contrived means, by which a single electric light will serve to illuminate at the same time two lanterns, placed side by side for exhibition. This is accomplished by placing the light between two reflectors, so inclined that each reflects it in the direction of the axis of one of the lanterns.

Autor of the post: Undefined

6. - But by the substitution Post Date: Mon, 4 Aug 2008 23:48:16 +0000
As an instrument for popular and general instruction, the solar microscope holds a high place. Until recently, its use has been restricted in these climates, by the circumstance of bright sun- shine, and a room having a suitable aspect, being conditions indis- pensable for its performance. But by the substitution of the oxy- hydrogen light, and, more recently still, of the electric light, the utility and pleasure, derivable from this instrument of popular illustration, have been immensely extended.

Autor of the post: Undefined

7. - Since it is desired Post Date: Tue, 5 Aug 2008 0:03:17 +0000
527 The principle of the solar microscope is the same as that of the magic lantern already explained. The instrument consists of two parts, essentially distinct one from another : the first, the illuminating ; and the second, the magnifying part. Since it is desired to exhibit a very enlarged optical image of a very minute object, and since the light which is spread over the image can only be that which falls on the object, it is evident that the brightness of the image will be more faint than that of the object, in the exact proportion in which the surface of the former is greater than that of the latter.

Autor of the post: Undefined

8. - But, in fact Post Date: Tue, 5 Aug 2008 0:20:57 +0000
To illustrate this, let us suppose that the object exhibited is an insect, a quarter of an inch in length, and that it is magnified 40 times in its linear dimensions, the length of the optical image will then be 10 inches, and its surface will be 1600 times greater than that of the object. The light, therefore, which illuminates the object, supposing the whole of it to be transmitted to the optical image, being diffused over a surface 1600 times greater, will be 1600 times more faint. But, in fact, the whole of the light never is transmitted, a consider- able part of it being lost in various ways in passing from the object to the screen.

Autor of the post: Undefined

9. - 528 Illuminating apparatus Post Date: Tue, 5 Aug 2008 0:34:56 +0000
The necessity, therefore, for very intense illumination in this instru- ment must be evident. If these conditions were not borne in mind, it might appear that a magic lantern might be converted into such a microscope, by merely increasing the magnifying power of the lenses ; but the light of the lamp, which is sufficient to illuminate a picture mag- nified 10 or 12 times in its linear, and, therefore, from loo to 144 times in its superficial dimensions, would be utterly insuf- ficient, if it were rendered 1 600 times more feeble. 528 Illuminating apparatus.

Autor of the post: Undefined

10. - In fact, the rays may Post Date: Tue, 5 Aug 2008 0:45:51 +0000
The illuminating apparatus of the solar microscope consists of a large convex lens, upon which a cylindrical sunbeam of equal diameter is projected. This lens causes the rays of such a sunbeam to converge to a point, and they are received upon the object to be exhibited before their convergence to a focus, and at such a distance from the focus, that the entire object shall be illuminated by them. In fact, the rays may be considered as forming a cone which is cut at right angles to its axis by the slider upon which the object is fixed.

Autor of the post: Undefined