Copy 2

An introduction to electricity. In six sections ... : illustrated with copper plates / by James Ferguson.

  • James Ferguson
Date:
1770
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to electricity. In six sections ... : illustrated with copper plates / by James Ferguson. Source: Wellcome Collection.

    22/156 (page 14)
    molt fide of the prime condu6tor-ball G. The top of this wire mult be fliarp above d; and efghik is a fly made of fmali brafs wire ; the ends of each arm next the center being fixed into a brafs cap, which is to be put upon the point of the crooked wire; and the other ends of all the arms are bent one way5 in an horizontal direction, and termi¬ nate in fliarp points. Each bended part e, f] gy hy iy k, mull make a fort of a right angle with the reft of the arm between it and the center, and thefe bendings muft be roundifh, not fliarp corners.—-When this fly is put upon the top of the crooked wire c it hangs like a mariner’s compafs up¬ on the pin that fupports it. 18. i^is a brafs hook fixed to a crofs bar of brafs, from which hang three bells Ry % with their clappers U and V,, which are fmali brafs balls. --The bells R and T are hung by metal chains; the middle bell S by a i ‘ ^ filk