Page:Notes and Queries - Series 2 - Volume 1.djvu/388

 380

NOTES AND QUERIES.

S. N 19., MAY 10. '56.

And over the door of his bed-chamber :

"Hie Crato cum medicis Musas conjunxit amoenas, Nostrum opus et vitam Christus Apollo regat."

At Salamanca, over the University library :

" Initium Sapientise timor Domini." At Seville, round the celebrated Geralda tower :

" Nomen Domini fortissima turris." At Toledo, on a high tower in the city walls, and under some statues of saints :

" Vos Domini Sancti, quorum hie prasentia fulget, Hanc urbem et plebem solito servate favore."

A road-side inscription :

" Straverunt alii nobis, nos posteritati, Omnibus ut Christus stravit ad astra viam."

Over the doorway of Sawston Hall : " Sub Jesu numine sit geuus et domus."

CEYREP.

On John Knox's house, High Street, Edin- burgh :

" Lvfe God abufe al, and yi nychbbovr as yi self. Builded A. D. 1490."

H. T. E.

RECORD'S " GROUND OF ARTS." (2 nd S. i. 79.)

MR. PISHEY THOMPSON, in his notice of this work, says it was " originally dedicated by Robert Record to Edward VI. in 1551." This date is a mistake, as the volume was first printed by Re- ginald Wolfe in 1549. (See Herbert's Ames, i. 600.) He goes on to say, " It continued to be the book in most general use until the publication of Cocker's Arithmetic in 1677." This is not exactly the case, as " Cocker " did not quite super- sede it. I have before me a volume with the fol- lowing title :

" Arithmetick ; or the Ground of Arts : teaching that Science, both in whole Numbers and Fractions. Theori- cally and Practically applied in the Operation and So- lution in Numeration, Addition, Subatraction, Multiplica- tion, Division, the Eules of Proportion, Fellowship, Barter, Rules of Practice, Exchange of Coin, Loss and Gain, Tare, Trett, and other Questions relating to Weights and Measures, Lengths and Breadths, Equation of Pay- ments, Commission to Factors, Rules of Alligation, and of False Position, &c. Originally Composed by Dr. Record, and others. And now perused, Corrected, new Metho- dized, much Improved ; and thereto added, I. A New Treatise of Decimals, with the Demonstration of each Rule, and the Relation it has to Vulgar Fractions ; also why Decimals are wrought as whole Numbers, &c. II. Tables of Simple and Compound Interest, with the Manner of Calculation, and use thereof in Resolving all the most necessary Questions concerning Interest anU Discount of Money ; the Purchasing or Selling Estates, in Land or Houses, in Present, or Reversion, in Fee or for time Limited, and for Fining off Rent, &c. III. The

easiest Method of Extracting the Square and Cube Roots of Numbers, whole or broken, and the use thereof in many material Instances. By Edw. Hatton, Pfrilomercat. London : Printed by J. H. for Charles Harper, at the Flower de Luce against St. Dunstan's Church, and Wil- liam Freeman, at the Bible against the Middle Temple Gate, in Fleet Street. 1699. 4to., pp. 203 + 82."

The preface thus opens :

" Though the Original Author of the following Treatise was one of the most Eminent Arithmeticians of his time (as appears by the great variety of Compendious and Excellent Rules therein, and the Esteem and Credit the Book acquired for near 150 Years -together) yet at length the Stile and Phrase growing obsolete, and some Errors, for want of the Author's Correction in Reprinting, having crept in, the Booksellers (not willing so choice a piece of Arithmetick should be lost for want of a little Publishing, the Principal parts being Extraordinary) were pleased to recommend the performance thereof to me," &c.

Prefixed to the volume is a portrait of "E. Hatton, JCtat. SUEE 35, 1699," drawn and en- graved by R. White. Query, wns this Edward Hatton the author of the New View of London, published in 1708 ? EDWARD F. RIMBAULT.

PHOTOGRAPHIC CORRESPONDENCE.

Mr. Lyte on a New Process for printing PJiotographs. In the course of some experiments on photographic printing, I have hit on a process which is very remark- able as threatening completely to abolish hypo from the photographic laboratory. It depends on the fact that the phosphate of silver darkens under the influence of light (a property first noticed by Dr. Fyfe), and its complete solubility in an acid liqui'd. I have already produced very fine results by its means, and see a fair* promise of a subsequent improvement. The method, as I employ it at present, is as follows : The paper is salted 011 a solution of phosphate of soda, i. e. the common or tribasic phos- phate, containing 1 part of phosphate to 25 of water. When dry it is to be sensitised with a solution of nitrate of silver containing 1 of nitrate to 5 of water, and after drying is to be exposed as usual. When printed it is to be placed in a solution of nitric acid, composed of 1 of acid to from 30 to 35 of water. Here the sensitive phos- phate instantly dissolves, and in five minutes the process of fixation is complete. It is now to be washed in one or two waters, and then to be placed in the colouring bath, which may be either sel (for, as described by Mr. Sutton, or the acid bath of chloride of gold, described by Legray. Sel (for, however, gives the finest tones. If the proof be thought too dark when finished, it may, after being passed through a bath of water, in which has been dissolved a bit of carbonate of soda, be placed in a bath of very weak cyanide of potassium, not more than 2 or 3 to 1000 of water. Great care is, however, requisite in this treatment, as the action of the cyanide is most energetic even when thus diluted. Otherwise, after a short washing with one or two changes of water, it may be deemed fixed and ready to be dried and finished. It should be rubbed when mounted with the encaustic of wax and turpentine. This process is doubtless capable of much improvement. Thus I have not the least doubt that if the proof were first washed, phosphoric acid might be advantageously substituted for the nitric fixing-bath ; and it yet remains to be found out how to produce the requisite tone ill the proof without the intervention of a separate colouring