BAIRD &TATLOCK (LONDON) LTD. 



3844 (Fig. A) 

 3844 s Science Lantern, improved form, for vertical and horizontal projections. 



Lantern as described below, in case, with limelight burner 



The lantern is of a neat and portable form, and is provided with a well-made case, fitted with hooks and 

 leather strap for carrying. 



The objective front is supported by double telescopic draw tubes, which allow a long extension, worked by a 

 handle actuating a triple quick screw, by means of which the objective can be quickly brought into focus without 

 any of the usual jerking and pulling. 



Fig. A shows lantern as used for projecting ordinary lantern slides, scientific apparatus, etc. ; the necessary 

 space and proximity to condenser required by some experiments being readily obtained. 



Fig. B shows vertical projection, used in showing lines of force, chemical combinations, drawing diagrams, etc. 



It is only the work of a few seconds to transform the projection from the horizontal to the vertical. To 

 do so simply 



1. Raise front half of condenser and slip reflecting mirror into its position. 



2. Unbayonet objective and refix on upright rod. 



This method of vertical projection obviates the necessity of having extra condensers and objectives. 



9 10 



3844 (Fig. B) 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



727 



