Abbe Drawing Apparatus No. 165.

fNo. & s. d.

165. Abbe Drawing1 Apparatus. In this apparatus the

drawing surface is seen by reflection at a mirror at the side of the instrument and a double prism mounted above the eyepiece is seen through an aperture in the silver coating between the prisms. The double prism is so mounted that it may be swung aside, as shown in the illustration, which renders the eyepiece free for ordinary observation. Two moderating glasses mounted in pivoted rings may be swung in front of the prisms so as to modify the light coming from the drawing surface.................................................1.10. 0

166. Large Abbe Drawing Apparatus. This instrument resembles in every essential the apparatus just described;

it has, however, a larger mirror (125X80 mm) . . . 2.10. 0

Drawing Board No. 167. Gisenhagen’s Drawing Board No. 168.

The above Drawing Boards, having limewood tops, afford in the first place a smooth and flat surface to draw upon; they possess, however, the further advantage that they can be raised, lowered, and inclined as may be required.

Codeword

Desinatior

Desinatis

38

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