Перевести последующие предложения 1 People living in St. Petersburg in 1873

Перевести следующие предложения
1 People living in St. Petersburg in 1873 saw the first electric light.
2 The plant producing engines was built last year.
3 We were demonstrated an operating device.
4 When determining the properties of this product the scientist мейд a lot of experiments.
5 Designing new systems we can use computers.
6 While investigating this phenomenon, he carried out the experiments in the laboratory of our research institute.
7 Raising the temperature we increase the agitation of the molecules.
8 Decreasing the temperature we slow down the reaction.
9 When comparing our experiments it is important to check if the conditions are
the same.