417 



Proceedings of the Roy (it Institution o/Grec^t Britain. 



, , , Weekly Evening MebtinJjTS;'' ^ ' 



The subject of the evening consisted of an account and illustration 

 of some Supplementary remarks on the Reciprocation of Sound. Tlie 

 matter belonged to Mr. Wheatstone, but was delivered by Mr. 

 Faraday. The new information contained in it has been embodied 

 in, the acpO[iiU^,giv^,Qjf.tJ}^^pu)4ej^tj qf Jle5^|i%9e^,,.^t pag:e ;i75 of this 



volume»?,xo'> ni jcrft ,8/)w 'j'^JiuximoO jndt yirf fi'.wi^i )!oinl«u> . ' 

 The tables in the library were furni^e^d as usual with objects of 



interest. 



ix.'iriniw'i , ;.!<>.. March lAih, 



^''l\tt^. TiiWeir'^ave the members an account of the chemical men- 

 struums used for etching upon steel plates ; he also described and 

 exhibited an instrument, called a perspectograph, for laying down 

 points in perspective. 



A very large specimen of native silver from Mexico was placed 

 anumg^sttho other objects upon the library table. 



jj JVIr. Millington gave an account of the manufacture and uses of 

 paper, accompanied with models and illustratipas of ti^ recent im- 

 provements, -^'^'i ^.+1' '/if tif /d I>f~^-j'j-*fifv'>i'- 

 Specimens of all kinds of paper were placed in the library, and 

 amongst them, some recently manufactured from straw, by a new 



- Dr. Harwood gave an account of the structure and economy of 

 the Greenland whale, illustrated by numerous fine specimens, pre- 

 jparations, and drawings of the animal and its various parts. 



A variety of productions from the East were placed upon the 

 library tables, by favour of Lady Raffles and Mr. Bennet. Some of 

 them were presented by the latter to the Museum. Dr. Boott also 

 gave a specimen of the wax myrtle plant (Myrica Cerifera), and of 

 the myrtle wax from the same plant. 



A drawing instrument, invented by Mr. Ronalds, was explained 

 in the library. A pencil and a small bead are so connected to- 

 gether by means of a thread passing over pullies, that if a person, 

 looking through an eye piece, will hold the pencil upon a sheet of 

 paper, and then watching the bead will move his hand, so that the 

 bead shall trace the lines of any object that is selected to be looked 

 at, he will find that, whilst he has been doing this, he has also made 

 a drawing of the subject upon the paper ; for the pencil and the 



