CHEMICAL FORMULAS AND EQUATIONS THAT CADETS, GRAMMAR-SCHOOL BOYS AND REAL SCHOOL STUDENTS USED IN PRE-REVOLUTIONARY RUSSIA

The modern writing of formulas appeared not immediately. At first conventional signs were used as circumferences, points and commas. There was verbal description of matters. There were formulas with indexes from above. Some formulas look today very unusual. Study shows, how formulas changed, undoubtedly presents certain methodical interest. In our article we bring some variants of writing formulas only. Possibly, will the study of chemical old times help us after 180 years after their appearance? As well as in the previous article of a surname of authors translation textbooks are italicized. Let's remind that chemical data in a school course in ХIХ often joined a century in physics textbooks. The translation textbooks which number has essentially decreased in the second half of the century were simultaneously applied. Present material, possibly, can be used at the work of modern teachers.