XVII. Description of a Magnetimeter, being a New Instrument 



for Measuring Magnetic Attractions, and Finding the 



Dip of the Needle; with an Account of Experiments 



made with it. By William Scoresby, Esq. jun. 



F. R S. E. M. W. S. Sfc. 



(Read January 22. 1821.; 



My Dear Sir, Liverpool, 9th Jan. 1821. 



About ten months ago, I had the honour of communicating 

 to the Royal Society, a description of a new instrument for as- 

 certaining the Magnetic Dip. Having made very consider- 

 able improvements in the apparatus, by means of which some 

 curious results on the magnetic laws, especially those that relate 

 to the production and annihilation of magnetism in iron, have 

 been obtained,— I now beg leave to submit to the Society a 

 drawing and description of my improved instrument, together 

 with an outline of some of the most interesting experiments 

 made with it. Many of the results appear to me to be new ; 

 if so, their importance will be my excuse for repeating some 

 parts of the description given in the former paper. It has 

 VOL. IX. p. I. Hh been 



