Specification of Robert Delap : boilers for steam engines.

  • Fall, Robert.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Robert Delap : boilers for steam engines. Source: Wellcome Collection.

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    3 Delap s Improvements in Boilers. at the same time. The boiler and cover are connected or detached expedi- ously, as occasion requires, by the contrivance. Fig. 3, an iron stirrup, screw, and strap, with an hinge at C. The strap is screwed fast to the side of the boiler. The stirrup is turned up over a projecting point in the cover on which 5 it is screwed down; there must be such number of these as will confine the steam. Or Fig. 4, an hinged strap, with the screw falling into the groove of a metal rim round the cover, instead of the above points ; D, D, I), Fig. 1, 2, 2a, the fire-places, communicating in the first instance equal heat to the oeconomical as to the common boilers; E, E, E, the ash pit, with registers; F, F, F, F, F, 2q F, F, F, F, F, the winding flues passing under and encircling (or in metal pipes through) the oeconomical boiler. G, G, G, j)ipes to convey the steam to the engine, as usual. Fig. 5, 6, the ground jdan of these flues ; their course is shewn by the unshaded part; the shaded parts shew the brick-work between and round • these flues ; the inner dotted circles on these flues shews the ground plan of the 2 5 common boilers. The outter dotted circles shew that of the oeconomical boilers. Should it be necessary for any one to have a larger steam engine than could be worked by the fire he has occasion for in his usual processes, he may (with a very small addition of fuel) obtain his object by having his flues constructed as in Fig. 7, and putting small fires in the grates H, H. When these boilers 20 are used to work steam engines (as in the foregoing instances), the steam ought to issue at all times with equal force, for which purpose the regu¬ lator, Fig. 8, is added to the steam pipe. 1, the beam; 2, a cylinder open at top, but close at bottom (except the small tube which connects it with the main steam pipe); in the cylinder is a piston well packed; 3, a sliding valve, or 25 cock, &c.; 4,5, two weights to be used as occasion requires. It operates thus :— When steam in equilibrium with the atmosphere is wanted, both weights 4 and 5 are taken off; the beam is then a true balance, having the piston valve, &c. attached to it. The engine is set to work by pushing down the valve or turning the cock, &c. wdiich opens the steam passage; the piston is 30 at the same time brought near to the bottom of the cylinder; they will remain in this state while the steam is in equilibrium with the atmosphere; but the instant it becomes stronger the piston is raised, and with it the valve or cock, &c., and thereby the steam passage is contracted, and thus the equilibrium will be restored, of course an equal motion in the machinery preserved. If a 35 stronger steam than the atmosphere is wanted, the weight 4 is put on, and the weight 5 off. If the reverse, the weight 5 is put on, and the weight 4 off. The valve or cock, &c. must be placed between the boiler and this cylinder. Another piece of oeconomy effected by these boilers (when used for the produc¬