Fig. 26.
Another mode of effecting this is shown in Fig. 26. a b is the handle turning on a strong pin at a, fixed to the back of the frame. c d is a shaft which should be of iron, but might be of hard wood, hooped at the ends, having two arms, e and f, projecting from it in opposite directions. This shaft turns on stout iron pivots which enter holes in stanchions securely fixed to the frame. These holes will be better for being bushed with brass. g is a short wooden link connecting the handle with the arm f; and h is a wooden rod which connects the arm e with a forked lug screwed to the feeder. All these connections are by stout turned pins of iron or brass. It is plain that every downstroke of the handle a b will bring up the feeder. All this is a matter of mere mechanical arrangement; the simpler you can make it, by diminishing as much as possible the number of pivots or turnings, the better it will be.
We conclude this chapter, and turn to the next branch of our subject, with the assumption that the organ is thus far satisfactorily advanced. When the new bellows are worked we assume that no hissing is heard, and no escape of air perceived at any of the holes when a slider is drawn, or at any part of the junctions of the trunk. We assume also that when any pallet is opened by drawing down the ring of its wire, a strong rush of wind will immediately follow, and will be as instantly stopped by releasing the ring, when the pallet will close with a ready and prompt snap. The sliders, too, must glide to and fro with perfect smoothness and ease.
Pass over no serious fault. Remedy all defects with unwearied patience, even if it involves a reconstruction of your work.
It is usual to paint the frame and bellows (leaving the ribs untouched, however) with some dark priming. A dull red was formerly in vogue; chocolate, dark brown, or a slaty black have now found favour in the eyes of builders.
CHAPTER VII.
PLANTATION OF THE PIPES.
We explained in a former page that it is well to plant all the pipes upon the sound-board before the pallets are fitted, because dust and chips are inseparable from the operation, and may be troublesome and mischievous if introduced into the grooves and conveyances. Some of our readers, therefore, having their stock of pipes by them, have perhaps already perused this chapter and acted upon its suggestions. It has been reserved, however, for this place in our work, in accordance with our wish to meet the case of workmen and young beginners who are under the necessity of proceeding by degrees.