Below are particulars on the construction of an enlarging lantern. Make a baseboard A, and to this attach the frame B of three sides, with a circular opening in front for a condenser at B1. Above and below this opening fasten grooved rails F and G to take the sliding negative frame. Join up four mitred pieces to form a frame K, and make the lens-board P. Connect the two with bellows. Bore a hole through K and P to take a brass rod M. Fasten K to F and G, and fix a turn-pin of stout wire at N to clamp the rod M. Fit up the negative frame to go in S, with an opening 4 in. by 3 in. and 4 1/4in. by 3 1/4 in. rebate. Sink the rebate deep enough to allow of the turn-buttons which hold the negative coming flush with the surface. The condenser Q, is fitted in a block R. Inside B is a second frame X of Russian iron. The holes in this (see dotted lines) are not opposite those in B, so that ventilation without outside light is secured. Short rails are fitted on A, between which the lamp wit h reflector runs. A four-wick paraffin lamp will be best.

Fit a door II. The base is hinged at T. This lantern could also be used as a magic lantern.

An Enlarging Lantern.