Specification of John Wallace : ships' safety hearth.

  • Wallace, John.
Date:
1857
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Wallace : ships' safety hearth. Source: Wellcome Collection.

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    Wallaces Improvements in the Safety Hearth. the hot vapour and smoke, which impel it in its ascent up the flue ; although this is not absolutely necessary, yet I would recommend the use of such covers to the jack, particularly in distant voyages, and where there is a large ship’s company. Figure 4 is a side section of the ship’s hearth, and Figure 5 is a front section, having the cover or upper part of the flue or chimney 5 removed in order to admit the smoke jack being put into its place ; Figure 6 is a plan with some of the parts removed, whereby the construction will more readily be seen. In all these Figures the same letters of reference indicate similar parts, and such is also the case with reference to the other Figures shown in the Drawing. . ' 10 On the cylinder, Figures 1 and 3, there is a pulley affixed for receiving and driving an endless chain A for turning the spit B, which is formed similarly to those commonly employed; G is a pulley affixed to one end of the spit, which receives motion and is actuated by the endless chain A; D, D, are the two side plates, which have gaps or slits E cut into them for the purpose of 15 receiving the spit; F, F, are the hooks by which they are affixed in their proper places, and are supported and retained by the bars or rods G. These side plates are seen separately in Figure 7, and in their places in Figures 2, 3, and 4. The bars or rods G and rods H are affixed to the front plate I, and slide in holes J, Figure 5, cut into the framing of the ship’s hearth. The rods 20 G support the side plates D, D, and the rods H support the dripping pan K, which dripping pan is shown separately in Figures 8, and in its place in Figure 5. Figure 9, L is a cover which rests on the front plate I, and on the front on the fire place, as shewn in Figures 1, 2, and 3. The object of the rods or bars G, H, sliding into the holes J is that the side plates D, D, the spit B, 25 dripping pan K, and cover L may be removed, and the front plate I shut against the bars of the grate or fire-place when roasting is not going on; previous to which, a metal plate, Figure 22, is put over the front grate to prevent the cold air from passing between the top of the fire; this metal plate is fixed by two pieces of iron, as represented thereon, by two holes made 30 in the frame to receive them, and it slips out and in at pleasure; it has also two handles to left it by. M are the front bars or grating of the fire-place, which I prefer to be in nearly a vertical position; they are seen in Figures 4 and 5, and the bottom grating or fire-bars N are shown in Figures 4 and 6; O, Figures 2 and 4, is the ash-pit, and P is a pan or trough to receive the 35 ashes from the ash-pit, such pan being shown separately at Figure 10; Q, Figure 2, is the door for feeding the fire with fuel; Figure 11 shows an inside view of the front plate I, and also a side view of the same separately;