138 ANNUAL OF SCIENTIFIC DISCOVERY. 



ica, gives results in line and stipple, which leave little to he de- 

 sired. i\Ir. llaniar^e of Edinburj^h, Mr. Lewis of I)iil)lin, Colonel 

 James, and many otiiers, have also attained great excelk'ncc in the 

 same direction. Messrs. Simonan and Toovey of Brussels, have 

 attained some success in the i)roducti(>n of half-tone; and the 

 attempts of Col. James in the same direction have not been 

 without promise. Still, the fact remains, that no process for tlie 

 actual production of photograjjiis from nature by means of plioto- 

 litho,i;rapliy is in practical working, or has liitlierto establislicd a 

 position, and that sucli a i)rocess remains an important desidera- 

 tum, any means of meeting which would be hailed with a glad 

 welcome by all concerned in the graphic arts. 



Unless we are mistaken in our estimate of a series of specimens 

 belore us, by Messrs. Bullock Brothers of Leamington, a process 

 which they have recently patented bids fair to meet the long-felt 

 want most successfully, and to render, with a fair amount of 

 delicacy, the true photographic gradation of negatives from na- 

 ture. The subjects before us, consisting of hmdseapes with 

 variety of foliage and arcJiitecture, are exceedingly excellent, 

 and jn-esent all the good points of a good photograph, perfect 

 gradation and half-ton(>, and great l>rilhancy, dilfering little in 

 general efleet from good silver prints from the same negatives. 



Messrs. Bullock liave followed in i)aths already partially trod- 

 den, but have made such practical deviations and modifications 

 as have led them to success where others have only failed. Their 

 aim is to secure in the transfer a suitable grain, so as to obtain 

 the kind of gradation possiljle in lithograpiiy, without producing 

 a coarse or woolly effect. Among the various methods by which 

 they propose to eU'ect this end, the plan used in jjroducing these 

 examples seems to be at once the most practical and eilicient. 

 A transfer paper is prepared with a plain solution of gelatin, and 

 when this is dry a grain is printed on it from an aquatint 2>l'i^te. 

 Paper so prejiared can be kept in stock, and rendered sensitive 

 when required by immersion in a solution of bichromate of potash. 

 It is then ready for printing and transferring in the usual manner, 

 and produces on the stone a photographic image, the continuous 

 gradation of which is broken up into the stip2:»led gradation of an 

 aquatint plate. This is tlie broad princiiJle ; but it admits of 

 much ingenious modification in practice, which is so far eti'eetive 

 that it produces the most successful and pi'omising examples of 

 photo-lithogra])hy with half-tone which we have yet seen. — Lon- 

 don Photographic News. 



PHOTOGRAPHY AND THE KALEIDOSCOPE. 



About a couple of years ago, a writer in an excellent trans- 

 Atlantic cotemporary, the " Scientific American," remarked : " Let 

 the photographer once combine the kaleidoscope with the camera, 

 and then see with what ease and rapidity he can produce the 

 most charming designs for dress goods, tapestry, oil-eloth, wall- 

 paper, and numerous other purposes. Such a thing is possible." 

 Almost at the same moment that the American writer stated this, 



