The Motor Shack is shown in detail in Fig. 380. Patterns for the floor (J), end walls (K), and side wall (L), are given in Fig. 383. Cut floor J and ends K out of 5/8-inch wood, and use a piece of cigar-box wood for side L. The roof is shown in pattern M (Fig. 383). This is also a piece of cigar-box wood. The roof piece must be soaked in water, to prevent its splitting, before it is bent over the rounded ends K, The notch in the front edge of the roof piece is provided to admit the derrick mast. The notch in the front wall K is provided to admit the beam Q, (Fig. 384), and the hole bored to one side of the notch is made for the hoisting-cable to run through.
Fig. 378. - Drum and Pulley Frame Pig. 379. - Spool Drum, Pulley and Shaft
Install the Motor before attaching the roof to the shack. Place the clockwork against wall L, mark the points where the pivots touch the wood, and bore holes through the wall at these points for the pivots to stick through. One of the
Fig. 380. - Detail of Motor Shack
Figs. 381 and 382. - Details of Turntable Truck
Fig. 383. - Patterns for Parts of Shack and Truck projecting pivots is for the alarm-winding key, another is for the time-winding key. Screw these keys onto their pivots, and they will hold the clockwork to the wall. Nail the winding-drum supports H to floor J and to front wall K.
Figs. 387 and 388. - How Pulley is Made Fig. 389. - Pulley Supports Fig. 390. - Derrick Boom
The motor shack is pivoted upon a base (N, Fig. 381),to turn as
A Turntable, so that the derrick-crane may be swung around in any direction, and the base N is mounted on spools (0, Fig. 382), to form a truck that can be moved along a track (Figs. 373 and 374). Pivot the shack with a screw slipped through a hole bored through the center of board N and screwed into the center of floor J. Slip the center portion of a spool (P) between floor J and board N.
The Derrick is the next portion to construct. First prepare
The Beam Q by the diagram of Fig. 384, with one end notched on each side to fit between the lower ends of the boom (Fig. 390). Slip the beam through the notch in the front wall of the shack, and nail it to floor /. Then prepare
The Mast R of the size shown in Fig. 385. At the upper end of this is fastened
The Mast Pulley T (Figs. 385 and 386). The pulley-wheel is
Figs. 391 and 392. - Details of Hoisting-Block Fig. 393. - Detail of Hoisting-Cable made of the ends of a spool (Fig. 387). The easiest way to saw off the ends of a spool is to drive three spools onto a stick whittled to fit tightly in their holes (Fig. 388), and then hold onto two of the spools while you saw off the ends of the third spool. Cut an axle to fit the pulley-wheel (U, Fig. 386), and prepare a pair of supports with a hole in each to receive the axle ends (S, Fig. 389). Nail the supports to the mast end as shown in Fig. 385.
The Boom (Fig. 390) has two side sticks (V), two separators (W), and a pair of pulleys (T). Make the pulleys like the mast-top pulley. Assemble the boom parts as shown. The lower ends of sticks V are pivoted to the end of beam Q, so the boom can be raised and lowered. Bore holes through strips V for screw pivots to run through.
The Hoisting-Block (Fig. 391) consists of a spool-end pulley (T), a frame made of two axle supports (5, Fig. 392), a separator (W), and a screw-hook (X). Assemble the parts as shown.
Heavy cotton wrapping-twine is best for
The Cables. Attach the cable for raising and lowering the boom to a small double-pointed tack driven into the upper separator W of the boom ( Y, Fig. 390), then run it over the pulley on the top of the mast, run it down through a hole in the roof of the shack, and tie it to the upper winding-drum.
Tie the hoisting-cable to a double-pointed tack driven into the under side of the upper separator W (Z, Fig. 393), pass it completely around the pulley of the hoisting-block, then run it up and once around the upper pulley of the boom, then down to and once around the lower pulley of the boom, and then through the hole in the front wall of the motor shack, and tie to the lower winding-drum. A drop of glue will hold the string cables fast to the winding-drums.
Tracks for the derrick truck to run upon can be made of a pair of long sticks, and these can be nailed to the tops of boxes, or placed across the tops of chair backs.