BINDING.
The two glasses are now taken up 1 and held in the hand, or better still, placed in a holder (see Fig. 452) and bound together with black paper, which may be purchased ready gummed in narrow and press well into contact with the glass, using a soft rag for the purpose. Some workers prefer to cut a V-shaped piece out at each corner on either side. It is perhaps a matter of fancy, but the former seems, simpler, and looks quite as neat if carefully clone. When one side is fixed, which should be done as rapidly as possible, the slide is turned round and the next side fixed in the same way. A little practice is all that is required, and it will be found very simple. A sharp grip of the binding at the extreme edge causes it to bend smartly into shape and fit neatly. When all four sides are clone, the glasses on either side should be carefully cleaned with a rag and a little warm water, and the slide may then be considered finished. It
is customary, however, for convenience in rapidly identifying the correct side of the slide, to place two white spots, one on either side of the mask, at the top of the picture as shown in Fig. 453. These in dicate the top, and the side which must he, placed towards the screen. It is not a] ways, however, that such spots may he used, and then the " spot binding strips" are useful, as they occupy less space (see Fig. 454). For those workers who do not care for the trouble of binding up the slide in the manner described, there is a special form of binder known as "Unified." It is only necessary to lay the glasses down and fold the sides over. Naturally, these arc a little more ex pensive. A somewhat similar affair is the "combination cover glass and binder " (see Fig. 155). These are supplied spotted and with title line. They can also be ob tained tinted.