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.

Figure 11 shows a model of a foundry crane, much admired for its
accuracy of design and finish. It was made by George Chase, of seasoned
maple with iron and brass connections. A swinging jib is pivoted at the
top to a brass plate screwed to the cross-piece of the frame, and turns
on a st