![]() (Deutsvhes Reich Geschmacksmuster) 836352 and D.R.G.M.985223. (Deutsches Reichespatent) No.206428, D.R.G.M. A.W.Faber 339 A.W.Faber-Castell 342, Columbus, System Rohrberg, D.R.P. These are smaller and a little ingenuity is required to make sure that they are centred and make contact. I currently use 4, Duracell LR44s with a diameter of 11.6mm and a height of 5.4mm. PX825s are no longer manufactured and are difficult to obtain. The calculator uses 4, 1.5V button cells, type Duracell PX825 with a diameter of 23.2mm and a height of 6.1mm. Faber Slide Rules Tina's Faber-Castell Slide Rules Where Dietzgen model numbers have been included in brackets, this information was obtained from Peter Holland's book 'Rechenschieber, Slide Rules, A.W.Faber' A.W.Faber-Castell TR3 Combined Slide Rule and Calculator.
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