Vorschlag die achromatischen Fernröhren erforderliche Länge durch ein Spiegeltelescop mit einem besonderen Glasspiegel bis auf mehr als Hälfte abzukürzen

The file will be sent to you via the Telegram messenger. It may take up to 1-5 minutes before you receive it.

Note: Make sure you have linked your account to Z-Library Telegram bot.

The file will be sent to your Kindle account. It may take up to 1–5 minutes before you receive it.

Please note: you need to verify every book you want to send to your Kindle. Check your mailbox for the verification email from Amazon Kindle.