http://sibved.livejournal.com/ ([identity profile] sibved.livejournal.com) wrote in [personal profile] sibved 2015-08-31 04:50 am (UTC)

>>А откуда взялась цифра 150? То есть газорезка могла быть примерно аж в 1865 году.<<
Вполне. Вы почитайте журнал "Всемирная иллюстрация" или блог http://bskamalov.livejournal.com - там много выдержек на тему достижений науки в 19в.
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