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OPTICAL LANTERNS, ETC. The “ Minerva'' Optical Lantern No. l 170 This instrument is constructed largely of cast aluminium, and is exceedingly hght and rigid. Portability and ease of manipulation are its outstanding features. The bellows front allows lenses of any focus from 6in. to 12in. to be used. Fitted with high candle power Projection Type Electric Lamp, in fixed position, the apparatus may be brought into use at very short notice. 1170 The “ Minerva ” Optical Lantern, as described, with objective of any desired focus up to 12m. Complete with 500-watt Projection Type Electric Lamp for lOO-wo/i circuit either direct or alternating. With Slide carrier ... £ 16 10 0 1171 Extra for Resistance, for use on any current up to 250 volts ... ... ... ... ... ... £2 0 0 1175 The “ Minerva ” Lantern, as No. l170, but fitted with a 250- watt Electric Lamp in place of a 500-watt Lamp £ | 6 5 0 1176 Extra for Resistance, for use on any current up to 250 volts ... ... ... ... ... ... £| I 0 0 1177 The “ Minerva ” Lantern, as No. l170, but fitted with 2%in. diameter “ Wigmore ” Projection Lens in helical mount, complete with 500-watt Projection Lamp {Resistance Ll extra) ... ... ... ... ... ... £21 0 0 1178 Ditto, as l177, but fitted with 250-watt Lamp {Resistance l176 extra) ... ... -. ... ... £20 15 0 1180 Fibre Carrying Case, with leather handle, lock, etc., to hold either pattern. Lantern, Resistance, Slide Carrier, etc. £1 13 0 1181 Tv.msvoYiMER,for useinplace of Resistance,250-watt £3 18 0 NEWTON & CO., 72 WIGMORE STREET, LONDON, W.l 9