210 Miscellanies. 



We are requested also to mention, that the patent right for the 

 Congress powders and die recipe for preparing the magnesian ape- 

 rient are for sale. Application for the purchase of them or of the 

 cabinet can be made to Mr. Charles Conolly, at Cornelius Dubois 

 Esq. of New York. 



10. Ewbank's Tinned Lead-pipes. — Mr. Thomas Ewbank of New 

 York, has invented a method of tinning lead pipes " after they have 

 been drawn to the proper size." This is ingeniously accomplished 

 by drawing the lead tubes (properly prepared with rosin on their 

 surfaces) through a bath of melted tin, kept at such a temperature as 

 to avoid the fusion of the lead. 



We have seen some of these tubes and their appearance promises 

 a perfect protection to the lead. Should this, after sufficient trial, 

 prove to be the fact, the discovery will be of great importance, espe- 

 cially for aqueducts. 



We have just seen a portion of a lead tube of two inches in di- 



ameter, which, having been laid down in alow meadow in Springfield 

 Mass. where there are the remains of an ancient hemlock swamp, 

 was, in the course of a few months, corroded through and through, 

 and for this reason great expenses are incurred in taking up and 

 replacing the spoiled tubes. We presume that the tinned tubes will 

 not be liable to this accident. 



- 



11. American Mangle or Domestic Callender. — This instrument, 

 invented and patented by Mr. I. Doolittle of Bennington, Vt., we 

 have seen used and we have conversed also with those who have 

 employed it, and find that its use saves a great portion of the labor 

 and all the fuel usually employed in the process of ironing table and 

 bed linen, towels, he. besides being much more expeditions and giv- 

 ing the articles a better lustre and whiter appearance. It is regarded 

 as a valuable auxiliary and by some is reckoned among the indispen- 

 sable utensils of the laundry. We can confidently recommend it as 

 a valuable acquisition to the conveniences of the family. 



. i 



of Platinum — Test Paper. 



Extract of a letter from Dr. Erastus F. Cooke, to the Editor, dated Wethersfield 



July 22, 1833. 



Dear Sir — Tn your reply to a letter of mine, (sometime since, in- 

 quiring the price of platina,) you expressed a wish to know something 

 of the result of my enquiry. I have to state, that I procured some 

 friends to write to London and to Paris in relation to the subject, and 



1 now send you the result. " We have just received an answer from 



