It helps to remember that this book is from the 50's. If you've looked at vintage patterns or clothes from that time you'll notice lots of little details. The smocked tucking is "especially suited to yoke treatments for dresses and blouses of plain fabric. It provides a texture contrast that, in itself, is rich and smart." Well, who wouldn't want to try that?To make it you will need to make the tucks on the lengthwise grain of the fabric. The tuck scale on the Tucker will be set on 1 and the space scale will be set on 2. You'll be making lots of tucks.
Tucks:
When you are through making all those tucks you'll need to get out your vintage Edgestitcher and attach it to the machine. Set the Edgestitcher so that the needle comes down in the center of the foot. You'll be using its edges as a sewing guide. Mark a straight line across the tucks. Sew across the tucks stitching them down flat. At the end of the row take the fabric out of the machine. Turn it around so you are sewing the tucks down in the opposite direction now. Use the Edgestitcher's edge to line up against the previous stitch line.

When you are completely finished steam the fabric from the back. Here is a shot looking straight down on the smocked tucks:
This technique is done before the pattern is cut out. After the steaming lay out the fabric with the pattern and cut. I made a small sample. To actually use it I would need to make a larger piece.This photo is from a slight angle so you can see the textural effect:
Is that not neat? Yes, it is!The only trouble I had making it was when the Edgestitcher caught the tucks on the edge of Slot 4. I put a piece of tape over and around the slot and stopped the problem. And removed the tape from my foot when I was done.
If you don't have a Tucker or Edgestitcher but make tucks in a different way you can still try this out. You might have to mark for each row the Edgestitcher makes though. The tucks are about 1/8 inch and 3/8 inch apart.
I was in Target the other day and stopped to look at some throw pillows that had a tucking detail that was similar to this one. That's the fun of trying out all these things--you start noticing more details and coming up with new ways to use them--and new ways to use the feet.
I don't know if the Tucker was standard in a box of attachments. I rather think it had to be bought separately as a specialty foot. The Tucker can make tucks (obviously) of various widths while marking for the next tuck--that's the neat part about it. It has two scales: one for the tuck width and one for the width between the tucks. It may seem a little confusing at first but give it a try and see that it's not. In fact, it's one of those feet that takes longer to explain than it does to sit down, set the thing up, and get sewing with it.
The Singer book says the only place the Tucker needs oiling is the marking lever. That's the lever crossing back over the scales. Pull it up and see if it moves. Put a tiny drop of oil on the stud holding it on. The reason it needs oiling is that the needle clamp pushes it down with each stitch so that it pushes the space scale down onto the spur blade (not a sharp blade!); this in turn makes a tiny crease in the fabric to mark for the next tuck. You don't need to know all this to sew with the Tucker--it's just a little explanation of how it works.
The small back scale is the tuck scale. It's numbered 1 to 8 and indicates the width of the tuck in eighths of an inch. Loosen the screw, set the scale using the tuck guide, tighten the screw. For a half inch tuck I set it on 4. Notice in the next photo that it is the guide you are moving--not the scale (it doesn't move).
The larger scale in the front shows in quarters of an inch the spacing between the tucks. Again loosen the screw, set the scale using the needle hole in the foot as the guide, and tighten the scale. This time it is the scale that moves. I'm setting mine at 6 for a half inch between tucks. If you wanted no space between tucks (blind tucks) make the numbers the same on both scales. It might seem natural to set this scale against the marking lever, but that's wrong--use the needle hole.
Generally set the tuck scale and then the space one. I do this before putting the Tucker on the machine. Go ahead and attach it, making sure to check that the needle comes down through the needle hole alright.
Sew. Try and keep the fabric evenly against the guide. You can see faintly how the mark (crease) for the next tuck is being made in the fabric in the next photo while the tuck is being sewn. (This photo was taken when I was trying out other tucks, so the settings are not the same as I stated above--just ignore that and look at the crease!)

I'm using muslin for my demonstration so the crease shows up well. Some fabrics won't crease as well. Also, you need to make sure you're using the right size needle and thread with the proper tension or your tuck will be puckered.
Where would you use all these tucks? Anywhere you can think of--they do add some nice detail. My 1920's book suggests collar and cuff sets, baby bonnets, lingerie frocks, dresses, bands for blouses and underwear, tucked medallions for underwear, pin tucked ruffles on underwear, and more underwear. I wonder if some people had fancier underwear than outerwear back then.
Would I buy a Tucker if I didn't have one? I don't think I would. I just don't make that many tucks in things. If you do, you might want to find one. 



I managed to pull the thread all the way out of this piece of fabric. If yours breaks you can usually still see the grain where the thread came from. If you can't pull a thread try and measure from the selvage or straight edge at several points and mark them. See the line in the fabric where the thread was?
Here's a pin tuck:
For this sort of thing you would make the pin tucks in the fabric first and then put the pattern on it and cut it out. Also if your pin tucks stop in the middle of the fabric you must pull the stitching thread ends to the back and tie them in a knot before clipping them. Don't reverse stitch and don't put a drop of glue on them to hold them--if you do, don't tell me about it, I refuse to listen.
I only made a couple of quarter inch tucks for show, but you get the idea. Again, you would mark for each tuck.
If you are looking at it and thinking, "That is not an edgestitcher." Then you are probably familiar with the modern foot called an edgestitcher. This is a vintage edgestitcher.
Hold your edgestitcher and see if you can slide the front piece back and forth with the lug. If you can't, put a drop of sewing machine oil under the blue steel spring at the back of the foot. Wipe any excess oil off. Because the edgestitcher front can slide slightly to each side you can adjust where the stitch line hits the fabric.


Press the seam open (says the book, but I prefer to press it to one side) and then turn the fabric right sides together (pressing the seams together here helps). Push the lug to the extreme left and put the seam back in Slot 1. Sew so the raw edge is concealed within the seam. Following are photos of the seam being stitched for the second pass and the finished seam.


A note here about piping. In many vintage sewing books a piece of flat bias cut fabric folded in half is called piping. There was no cord in it. If it had cord in it, it was called cording. If you look at prepackaged piping today it's called piping cord. So if some of you are wondering why I'm calling flat bias piping, now you know. (We'll try out a cording foot in a few weeks).
Place the other seam (piece of fabric) in Slot 5 which is near the front on the right. Adjust the edgestitcher lug so the stitching is very close to the fold. Try and keep the fabric edges against the slot edges as you sew. The bias seems to feed in by itself rather easily. 
This next photo shows the beginning of the piped seam where I stopped a few times and moved the lug. The stitching goes off the edge of the seam, so I stopped and readjusted it to hit on the edge.
To sew them hold them straight and slightly overlapping.

When done repeat down the other side.

When done go back and sew down the other side. Preferably with a different foot (the regular presser foot) or else your stitches might be as sloppy as mine.