Figure 7 represents the model of an inclined railway constructed upon the plan of the inclined railway actually in use between Hoboken and Jersey City Heights. A board forty-five inches in length and ten inches in width connects the terminal platforms of this model. The upper platform rests on a support thirty-three inches in height; to this support is attached an axle turned by a crank, on which are wound the reversed cords which connect with the ascending and descending platforms. These platforms are mounted on rollers and the cars while in motion are kept in a horizontal position. This model was constructed by Everett L. Thompson. The same boy constructed also the model shown in Figure 8--a dumb-waiter with original arrangement of cords and pulleys. The frame is thirty-six inches in height, eleven inches in width, and five inches in depth. Inside, a carrier with shelves is raised by a cord passing over four pulleys, the action of which may be seen through glass slips fitted in grooves. To the end of a cord is attached a weight which balances the weight of the carrier and contents. The frame-work was stained a dark mahogany color, oiled and varnished. Figure 9 represents a miniature guillotine as made by David W. Benedict. It was copied after one brought from France and exhibited at a well-known museum in New York City. The frame is twenty-two inches in height, and the block to which is fastened the tin blade, falls through the grooves in the posts to the rest upon which lies the head of the criminal. The cord raising the block runs over the pulleys, and is wound on the cleat when not in use. A box beneath receives the head of the imaginary victim as it falls. The machine with the exception of the blade was painted in bright vermilion and varnished. Figure 10 shows a small derrick constructed after a sketch of one used in the erection of the Madison Avenue bridge across the Harlem River. A mast of maple twenty-seven inches in length is mortised into an oak base, ten by twelve inches in size. A projecting arm, or jib, is fastened to the mast by a clasp of heavy tin. A cord and pulley keep the jib at a proper angle with the mast. The weight is hooked to a double pulley connected with the single pulley near the end of the jib; the cord, passing over a wheel in the mast and then passing downward, is wound upon the axle by turning the crank; a toothed wheel and ratchet stops the weight at the desired height. Neater pulleys than could be purchased were made by joining two wooden buttons and placing them in a whittled frame bound with piano-wire. The mast and jib were painted a dark blue and the base was polished and varnished.