This may be made as follows: Take a rectangular board (Fig. 37) eleven and a quarter by thirteen and a half inches. On both ends of one face of this, nail hard-wood pieces (Fig. 37, _e, e_) one inch square and eleven inches long, so that one end (Fig. 37, _g, g_) shall lack one-fourth inch of reaching the edge of the board. On the other face of the board, nail a strip (Fig. 37, _c_) four inches wide and eleven and a quarter inches long, at right-angles to it, and in such position that the ends shall just reach to the edges of the board. Midway between the one inch square pieces, screw on another hard-wood strip (Fig. 37, _d_) one inch square and four inches long, parallel with and three-fourths of an inch from the edge. To the bottom of this, screw a semi-oval piece of hoop-steel (Fig. 37, _b, b_), which shall bend around and press against the square strips. The ends of this should not reach quite to the bottom of the board. Near the ends of this spring, fasten, by rivets, an inch strap (Fig. 37, _a_), which shall be straight when thus riveted. These dimensions are for frames eleven inches square, inside measure, and must be varied for other sizes. [Illustration: Fig. 37.] To use this block, we crowd the end-bars of our frames between the steel springs (Fig. 37, _b, b_) and the square strips (Fig. 37, _e, e_); then lay on our top-bar and nail, after which we invert the block and nail the bottom-bar, as we did the top-bar. Now press down on the strap (Fig. 37, _a_), which will loosen the frame, when it may be removed, all complete and true. Such a gauge not only insures perfect frames, but demands that every piece shall be cut with great accuracy. And some such arrangement should always be used in making the frames. The projecting ends of the top-bar will rest on the tins (Fig. 33), and thus the frame can be easily loosened at any time without jarring the bees, as the frames will not be glued fast, as they would in case they rested on the wooden rabbets. The danger of killing bees is also abolished by use of the tins. When the frames are in the hive there should be at least a three-sixteenths inch space between the sides and bottom of the frames, and the sides and bottom of the hive. Even doubling this would do no harm; though a much wider space would very likely receive comb, and be troublesome. Frames that fit close in the hive, or that reach to the bottom, are very inconvenient and undesirable. To secure against this, our lumber must be thoroughly seasoned, else when shrinkage takes place our frames may touch the bottom-board.