USEFUL PROJECTS. 



861 



slate, with the first four rules of 

 arithmetic engraved upon it, I re- 

 conamend as a useful article in pri- 

 vate families, as by it children may 

 be exercised in those rules with 

 very little trouble. 



An addition sum may be cut 

 upon a slate, to do for the pur- 

 pose of addition, subtraction, mul- 

 tiplication, and division, by set- 

 ting the lines at a considerable 

 distance from each other, and mak- 

 ing the upper lines the largest 

 numbers for subtracting, but it 

 makes rather a complex article, 

 and examples for children cannot 

 be too plain. 



1 have prepared some slates with 

 designs engraved upon them for 

 learning to draw from, but I do 

 not consider this as a very impor- 

 tant article. 



I should have been happy to 

 have attended personally upon the 

 Society, but through confinement 

 in business and my small means,. 

 I have taken the liberty to send the 

 slates by a friend. 



I am, Sir, your humble servant, 

 Tjios. Warren, Jun. 

 Bury St. Edtiiuncls, 



Jan. Uh, 1809. 

 To C. Taylor, M.D. Sec. 



Certificates were received from 

 Mr. John Powell, of Islington, and 

 sixty other respectable persons, 

 stating that they think Mr. War- 

 ren's invention is likely to prove of 

 considerable public utility. 



The ThanJcs of the Society for the 

 Encouragement of Arts, S;c. 

 were voted to Mr. S. Roberts, 

 Chairman of a Committee ap- 

 pointed at Sheffield for encou- 

 raging the Siveeping of Chim- 



neys luithout the use of Climh- 

 ing-hoys. \¥rom the Trans- 

 actions of the Society. ~\ 



The Society, anxious to relieve 

 the sufferings of humanity, have 

 attended with much pleasure to the 

 endeavours of the inhabitants of 

 Sheffield, and co-operated with them 

 in their attempts to supersede the 

 necessity of employing climbing- 

 boys ; they have, therefore, im- 

 mediately on receiving the follow- 

 ing communication, ordered it to 

 be inserted in their volume, and 

 an explanatory engraving of the 

 machinery employed to be an- 

 nexed. 



The original drawings are pre- 

 served in the Society's repository. 



The former communications, 

 made by the Society of Arts, &c. 

 on the subject of sweeping chim- 

 neys by machinery, may be found 

 in the twenty-third and twenty- 

 fifth volumes of their transactions. 



Sir; 

 In making this statement to the 

 Society instituted for the Encou- 

 ragement of Arts, &c. respecting 

 an object which has frequently en- 

 gaged their attention, the commit- 

 tee who make it are actuated by a 

 desire of putting the Society and 

 the public in possession of all that 

 information which they have ob- 

 tained from extensive experience, 

 thereby enabling the Society to 

 form a more accurate and just esti- 

 mate of the degree of probability 

 that there is of final success, than 

 they otherwise might be able to do. 

 As the committee mean not to 

 found any claim to reward, they 

 have only been anxious to convey 

 the information in the most conve- 

 nient and ready way, without, per- 

 haps. 



