While waiting for the case to dry, the work on the bag can be done. Two yards of close-woven white muslin, or one yard of 60-in. sheeting, is required for the front. For the sides, closely woven black material should be used. Figures 1 and 2 show the dimensions, the white portions representing patterns, and the shaded portions material for hems and seams. The material is folded over the pattern, basted down, and hemmed at the dotted lines, 1¹⁄₂ in. from the edge. Sew the front to the curved sides. Allowance for shrinkage, when the bag is washed and fireproofed, has been made in these sizes.
| Fig. 1 | Fig. 5 | Fig. 7 | |
| Fig. 2 | Fig. 8 | ||
| Fig. 3 | Fig. 9 | ||
| Fig. 6 | |||
| Fig. 4 | |||
This Homemade Skylight was Made at a Cost of $3, Gives Satisfactory Service, and Is Not Unsightly
For fireproofing the bag, the following formula is good: water, 60 oz., ammonium phosphate, 4 oz., ammonium chloride, 8 oz. Soak the fabric half an hour, wring it out slightly, and hang it up to dry.
Cut a hole, 6 in. square, in the lower half of the case for the door F, Fig. 5. The door is of galvanized sheet iron, 7 in. square, covered on one side with imitation leather and provided with a leather handle. The door slides in guides of mount board, or metal, as shown in Fig. 4. Figure 8 shows the notch below the door to allow play for the spring of the flash lamp, in place in Figs. 5 and 6. Mine was made for cartridges, but by attaching a pan of heavy tin, I use it for flash powder.
The leather socket, into which the top of the holder G, is slipped, is shown in detail in Fig. 7. Suitcase catches, D, lock the apparatus in open or closed position. The roof E, is supported by two folding desk slides.
To fasten the bag in place, slip a cheap yardstick, or strip, cut to the proper length, in each of the hems at the edges, and set them snugly inside and against the sides of the open case and under the edge of the roof. Fasten them with screws, as shown at the edges in Fig. 5. The bag is easily removed by withdrawing the screws and the strips, for washing and fireproofing it again. The front must hang away from the lamp before the charge is fired, or the bag may be burned. After firing the flash, the skylight is carried out and the smoke expelled.
Fuel Box in Seat Filled from Floor Trapdoor
