What is New or Changed


10th Februuary 2026Lawrence Engineering Services Molecular Ratio Slide Rule New Entry
10th Februuary 2026Meissner K-G VEB GalvanotechnikNew Entry
10th Februuary 2026Abbot Brown Isotope Handling Calculator No. 1, A.E.R.E., HarwellNew Entry
13th January 2026Dyna-Slide Solution Concentration and Gas Law Slide RuleNew Entry
13th January 2026Dyna-Slide Mole Fraction Slide RuleNew Entry
13th January 2026 Graphic pH CalculatorNew Entry
23rd June 2025 Shanghai ChemicalNew Entry
16th February 2025 Marcantoni 25 CH ChemicalNew Entry
16th February 2025 Donald Hedberg Chemical PredictorNew Entry




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Created by Rod Lovett