Journal of bacteriology . ymeans of the switch which constitutes a part of the bath, and the desired temperature thus secured. The bath has a constant water level attachment, so that the water level may be kept constantat anv point within a range of 25 mm. The regularity of the water level is 1 mm. Capacity of bathICOO cc. As the heating units are inserted in brass tubes placed permanently inside of the baths, 20 the bottom, their heating value comes to 99% of the theoretical expenditure of energy. Placedas they are, the heating units are absolutely protected from accidental injury. To
Journal of bacteriology . ymeans of the switch which constitutes a part of the bath, and the desired temperature thus secured. The bath has a constant water level attachment, so that the water level may be kept constantat anv point within a range of 25 mm. The regularity of the water level is 1 mm. Capacity of bathICOO cc. As the heating units are inserted in brass tubes placed permanently inside of the baths, 20 the bottom, their heating value comes to 99% of the theoretical expenditure of energy. Placedas they are, the heating units are absolutely protected from accidental injury. To replace these unitstakes no more time or skill than to replace an incandescent lamp in its socket. This bath operates on either a direct or alternating current of 110 \olts, and may be attachedto any lamp or Hubbell socket. Complete with four heating units, but without flash, (P^C f\f\clamp, or condenser Net «P^»).UU CENTRAL SCIENTIFIC COMPANY 412-420 Orleans Street (After May 1, 460 East Ohio Street) CHICAGO, U. S.
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