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148 HAND BOOK 'OF KINE M ATOGR APHY. Next (fig. 113), we have a very clearly drawn illustration of a Pathe condenser holder. A glance will serve to show how such a holder with glasses ready set in it, can be taken up in the hand by means of the top handle, and dropped into place in the front of the lamp house almost as soon as a crack in the existing condenser glass is seen. Con- denser cracking is, however, to some extent at least, avoidable if due care is taken to provide for the ventilation of the glasses in their cells. Such a well-ventilated cell is shown in fig. 114, illustrating the Primus condenser of Messrs. Butcher. It also has the merit of being as reason- able in price as 1 it is efficient in action. The Kineto extra heavy condenser (fig. 115) is an example of another highly efficient system of mounting condenser glasses accu- rately and expeditiously by the employment of a suitably solid trio FIG. 115. KINETO'S EXTRA HEAVY CONDENSER. of tubed rings, which interlock by means of quick-acting bayonet catches. Bayonet catches also hold this extra heavy condenser in the lamp house body, thus allowing of its removal for renewal of a cracked lens in almost no time. BUSCH PROJECTION LENSES are of three types. First come the ordinary kinematograph lenses put out by this firm. These are listed at a uniform price of 28s. for any focus from two and an eighth to seven and a quarter inches. They are good sound lenses, and the only marvel is that the public still go on paying a guinea or more a time for worthless nameless rubbish in the way of kine lenses, when instruments by a reputable maker are to be had at this moderate figure. Next we come to the Busch Double Illumination projection lenses. Here a new principle is involved, in addition to the general high quality, we get in the cheape'r series just alluded to. In these Double Illumination Lenses there is a large gain of effective light on the projection screen, a point which renders them well worthy the especial attention of limelight exhibitors. Still, the price remains extremely moderate, though all the time the quality is of the highest for instruments of the class indicated. But we pass on to the final grade in the Busch scale of excellence. Here price becomes altogether a secondary matter, but our Busch kinematograph lens belongs to this highest plane of excellence, and is indeed a wonderful instrument. Named the' Glaukar Projection