Housed Joints Or Tank Joints. Fig. 116.

Material: 3 pieces, 4" X 3" X 7/8".

These joints are used in making waterproof tanks and sinks.

Fitting the joint: At a is shown the form of joint generally used upon work which will allow sufficient wood beyond the groove, as at c, to give strength; it is somewhat cheaper to make than the joint at b, which is commonly used for light tanks and sinks, as it may be made more nearly water-tight than the other form.

1. Smooth the piece which is to connect the two ends.

2. Mark with a try-square and knife the side cuts of the groove of end a, by adaptation of the method described in Exercise 61.

3. Mark the end of the tenon of b with a gauge, and lay out the shoulder with a knife.

Fig. 116. - Housed, or Tank, Joint.

4. Mark the side cuts of the groove to receive the tenon by the same method used in 2 above. Do not change the set of the gauge until it has marked the depth of the cuts a and b in the end pieces.

5. Saw and make grooves carefully to marks.

6. Smooth and sandpaper all sides of the pieces which will be inside after the model is together.

7. Glue the model together, holding it with hand screws until the glue has set, after which, smooth and sandpaper wherever necessary.

Joint a is used in stair building, in fitting the risers and treads into the skirting board, and in the inside corners of the baseboards of the best buildings, as the joint will not be opened by seasoning or settling. If a water-tight job is desired, the joints should be thoroughly doped with white lead.

In building a water-tight tank or ink, the lower edges of the sides and ends should be doped with white lead, and two or three strands of cotton wicking, or soft twine, laid smoothly upon them. The bottom, being thoroughly nailed, will press upon the twine and calk the joint, which, if well made, will be water-tight.

This exercise should be so closely fitted that it will not require glue to hold it together, though it may be used if necessary, or the joints may be fastened with 1 1/2" brads.