Keywords: Potash Bichromate Cell.jpg taken from William Edward Ayrton Practical Electricity London Cassell 1891 http //www archive org/details/5thpracticalelec00ayrtuoft Online Page 223 Chapter V Figure 84 and 85 1891 William Edward Ayrton PD-OLD History of electric batteries Scans from 'Practical Electricity' 1891 |