This punt, as shown in Fig. 1, is built 15 ft. long, about 20 in. deep and 4 ft. wide.  The ends are cut sloping for about 20 in. back and under.  The sides are each made up from boards held together with battens on the inside of the boat near the ends and in the middle.  One wide board should be used for the bottom piece.  Two pins are driven in the top board of each side to serve as oarlocks.

The bottom is covered with matched boards not over 5 in. wide.  These pieces are placed together as closely as possible, using white lead between the joints and nailing them to the edges of the side boards and to a keel strip that runs the length of the punt, as shown in Fig. 2.  Before nailing the boards place lamp wicking between them and the edges of the side boards.  Only galvanized nails should be used.  In order to make the punt perfectly watertight it is best to use the driest lumber obtainable.  At one end of the punt a skag and a rudder can be attached as shown in Fig. 3.

[Illustration:  Easy to Build and Safe to Use]

** Photographers’ Printing Frame Stand [123]

When using developing papers it is always bothersome to build up books or

[Illustration:  Adjustable to Any Height]

small boxes to make a place to set the printing frame in front of the light.  Details for making a small stand that is adjustable to any desired height are shown in the sketch.  In Fig. 1 is shown the construction of the sliding holder.  A piece of 1/4-in. gas pipe, A, is cut 1 in. long and fitted with a thumbscrew, B. The piece of pipe is soldered to the middle on the back side of a piece of metal that is about 4 by 4-1/2 in. with its lower edge turned up to form a small shelf as shown at C. The main part of the stand is made by inserting a 5/16-in. rod tightly into a block of hard maple wood that is 1 in. thick and 3-1/2 in. square (Fig 2).  The pipe that is soldered to the metal support will slide up and down the rod and the thumbscrew can be set to hold it at the desired point.

** Heat and Expansion [124]

Take an electric light bulb from which the air has not been exhausted and immerse it in water and then break off the point.  As there is a vacuum in the bulb it will quickly fill with water.  Shake the bulb gently until a part of the water is out and then screw the bulb into a socket with the point always downward.  Apply the current and the heated air inside will soon expand and force the water out with great rapidity.  Sometimes this experiment can be done several times by using the same bulb.  —­Contributed by Curtiss Hill, Tacoma, Wash.

** Photographing a Streak of Lightning [124]

The accompanying illustration is a remarkable photograph of a streak of lightning.  Many interesting pictures of this kind can be made during a storm at night.  The camera is set in a place where it will not get wet and left standing with the shutter open and the plate ready for the exposure.  Should a lightning streak appear within the range of the lens it will be made on the plate, which can be developed in the usual manner.  It will require some attention to that part of the sky within the range of the lens so as to not make a double exposure by letting a second flash enter the open lens.  —­Contributed by Charles H. Wagner.