which is inclined at an angle of 22Y20 with respect to the optic axis of the microscope, forms a sharp flat picture on the drawing surface, which can either be traced on paper or demonstrated to a small number of students.

To facilitate the use of the arrangement we have designed a drawing board surmounted by a Liliput arc Lamp with sliding foot and a clamp for securing the foot of the microscope to the board,

together with an iron frame and black cloth tent.

No £. s. d. Codeword

169. Drawing- Mirror with Clamping- Ring-..................0.15. 0 Desinabit

170. Drawing- Board with Foot Clamp and Liliput Arc Lamp with Condensing- Lens mounted on upright to

raise and lower.......................................2.15. 0 Desinabo

171. Lig-ht-Proof Tent with Collapsible Iron Frame . . 1.10. 0 Desinai

172. Apparatus for Drawing- and Demonstrating- Projected

Images as Suggested by Prof. Edinger complete .5. 0. 0 IDesinamus

Apparatus for Drawing Objects in their Natural Size No. 173.

Apparatus for Drawing Objects in their Natural Size or Slightly Magnified or Minified. *) The apparatus consists of a lens stand No. 218 with heavy iron foot and a drawing apparatus proper which attaches to the stand by means of a ring adapter. In its general arrangement the drawing apparatus is similar to that of Abbe, from which it differs only in that the usual cube has been replaced by an equilateral rectangular prism having its hypothenuse surface silvered.

The mirror measures 10X8 cm and when required for use is slid to the end of the arm, inclined at an angle of 450 and finally

*) Zeitschrift fur wissenschaftliche Mikroskopie, Vol. XXIX 1912, 79—81.

40

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La langue de reconnaissance de l'OCR est l'Anglais.

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