| 摘要 |
<p>Appts. consists of a Petri dish in a cabinet into which the air to be analysed is suched in by a fan. Previously some germs known to be present have not been found on the Petri dish. Appts. has an air channel with a cone at the entry, and pref. a conduit leading directly from the cone to the Petri dish. A filter to reduce the air flow is fitted downstream of the Petri dish, and pref. downstream of the fan. The Petri dish is pref. placed on the drawer with a perforated bottom, in a cabinet that can hold several dishes.</p> |
