406 



NOTES AND QUERIES. 



[No. 235. 



great trouble and expense) in forming this ex- 

 ceedingly interesting and valuable collection for 

 his projected work, to be entitled ' Form^e 

 Precum, or National State Prayers, issued by 

 Authority, on Fast and Thanksgiving Days, and 

 other public Occasions, from the Reformation 

 to the present Time ; ' those in manuscript are 

 copied with great care from the originals in 

 public libraries and private collections." 



This important collection may possibly be un- 

 known to some of your readers who take an in- 

 terest in matters liturgical. 



W. Sparrow Simpson. 



Having made it a point, for some years past, to 

 preserve at least one copy of each Occasional Form 

 of Prayer, and wishing to comply with Mr. Lath- 

 burt's request, I send a list of those in my own 

 possession. 



Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Prince. 1841. 

 Form and Thanksgiving for Preservation of the Queen 



" from the atrocious and treasonable Attempt against 



her sacred Person." 1842. 

 Form and Thanksgiving for abundant Harvest. 1842. 

 Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Princess. 1843. 

 Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Prince. 1844. 

 Form and Thanksgiving for Victories in the Sutledge. 



1846. 

 Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Princess. 1846. 

 Form for Relief from Dearth and Scarcity. 1846. 

 Form for Removal of Dearth and Scarcity. Fast. 



1847. 

 Form and Thanksgiving for abundant Harvest. 1847. 

 Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Princess. 1848. 

 Form for Maintenance .of Peace and Tranquillity. 



1848. 

 Form for Removal of Disease. 1 849. 

 Form and Thanksgiving for Removal of Disease. 



1849. 

 Form and Thanksgiving for Delivery of the Queen, 



and Birth of a Prince. 1850. 



Abhba. 



PHOTOGRAPHIC CORRESPONDENCE. 



Photographic Query. — Given the diameter and focal 

 length of a simple achromatic lens ; at what distance 

 from it must a diaphragm of given diameter be placed 

 to give the best possible image ? O. 



Improvement in Collodion. — As there are many pho- 

 tographers who are not members of the Photographic 

 Society, and who do not see the journal published by 

 that body, a statement of what 1 think will be found a 

 very material improvement in the manufacture of col- 

 lodion may not be unacceptable to the readers of " N. 

 & Q" To five drachms of pure washed ether, add one 

 drachm of alcohol 60° over proof, and dissolve therein 



sufficient soluble cotton to make it of the consistence 

 of oil (the exact quantity must depend rather upon 

 the dexterity of the operator, as the thicker it is the 

 more difficult to use) ; then add twenty minims of 

 chloroform, dropping in the latter, which will fall to 

 the bottom, but is readily dissolved on shaking the 

 mixture for a few minutes. 



To two drachms of the same alcohol add the iodizing 

 material preferred, and mix with the other ingredients. 



The above will be found to flow very evenly and 

 smoothly over the plate ; is tough, intense, and struc- 

 tureless in appearance. I have not yet determined 

 what is the best iodizing mixture, but at present I 

 prefer iodide of potassium alone, if pure, and twenty 

 grains to the ounce of alcohol is the proportion I gene- 

 rally adopt ; thus having five grains in each ounce of 

 collodion. 



Lastly, as regards the soluble cotton, I cannot find 

 any better material than that produced according to 

 the formula published by Mr. Hadow, in the March 

 Number of the Photographic Journal, thus: " Take of 

 nit. potash, five parts; sulphuric acid, ten parts; water, 

 one part ; all by weight. Add the water to the nitrate 

 of potash, and then the acid, and immediately immerse 

 as much cotton wool as can be thoroughly saturated by 

 the mixture, leaving it in for at least ten minutes, and 

 wash with a great abundance of water. The object of 

 adding the cotton immediately that the acid has been 

 mixed with the nitrate of potash, is to expose it to the 

 action of the chemicals while they are at a temperature 

 of from 120° to 130°. For farther particulars on this 

 head, I must refer to Mr. Hadow's paper. 



Geo. Shadboi.t. 



[This application is not a novelty to us : Dr. Dia- 

 mond has for some time added a small portion of his 

 amber varnish (which is prepared from chloroform) to 

 his collodion, and with satisfactory results. It is a 

 pity that so admirable a varnish is not to be procured 

 at the generality of photographic warehouses. We 

 have never yet been able to procure any which will 

 bear comparison with some which Dr. Diamond was 

 enough to prepare for us. — Ed. " N. & Q."] 



Printing Positives. — I will venture to assure Ama- 

 teur that, — if he will follow Dr. Diamond's formula 

 for albumenizing Canson paper, either positive or nega- 

 tive, viz., 



Chloride of sodium (salt) - - 5 grs. 



Chloride of ammonium - 5 grs. 



Water - - - - - 1 oz. 



Albumen, or the white of one egg, which 



is near enough for the purpose - 1 oz. 



and will excite this paper by floating it for about two 

 minutes on a solution of nitrate of silver twenty grains 

 to the ounce, distilled water, — provided his che- 

 micals are good, he will obtain perfectly satisfactory 

 results. 



Let his fixing bath be a saturated solution of hypo, 

 soda, and if newly made let him, as recommended by 

 Dr. Diamond, add 40 grains of chloride of silver to 

 every 8 ounces of the solution. The addition of a 

 grain of sel d'or to every 8 ounces of solution will 

 greatly improve the tones of colour ; and if, after some 



