(46) bar scale of 1/14 inch to 1 foot (47) bar scale of ½ inch to 1 foot

46 as above, Bank Stock Office, a key of A B C D E F and K Fire Place / L Smoke / M Cast Iron / Plates to form / the divisions / for Warm Air / N 2 inches brick / work to prevent / the Smell of the / Iron.... / O 4 inches Cavity / to contain the / heat of the body / of the stove / P Box to clean / the Stove, G Brick Wall / H Bricks 4 inches / thick to form / divisions for / the Conduit / for Cold Air / I Opening to / admit Cold Air / J Revolutions of / Cold Air, Q 4 inches Cavity / for Warm Air / R Windsor bricks / on Edge..... / S Bars to cover / the top of the / Stove / T Circular brick / Pier / V holes to convey / the Warm Air / U, N^o 8 (six times), N^o 12 (three times), 14 (three times), 15 (three times), 16 (twice), 9 (six times), N^o 10 (eleven times), 17 (three times), 18 (four times), 20 (three times), 21 (four times) 47 Bank Stock Office, Elevation of external Projection to receive / Flues of the Stoves and / Revolutions for warm Air to be / conveyed into the Office, Section through Line G H, 1^st Plan, Plan to Cellar of B S Office, 3r^d Plan, Plan of Flues, 2^nd Plan, Plan of Chimney Piece and Projection / to receive Flues

• (46-47) datable to 1792-93

(46) Pen, pale red pen, sepia, burnt sienna and blue washes on wove paper with one fold mark (523 x 649) (47) pen, pencil, pale red pen, sepia, yellow ochre, burnt sienna washes on wove paper with one fold mark (643 x 508)

(46-47) attributed to William Lodder (assistant 1789-?) or Charles Ebdon (assistant 1791-1792)

According to Willmert drawing 46 shows the hall's heating system as executed: a brick firebox in the centre of the cellar producing warm air channeled into the free-standing stove above. This is most certainly the heating system fabricated by A. Ramellie for £138:18:0 and installed 'in the cellar' in April 1793
In drawing 46 the firebox also appears linked to the hypocaust system shown in drawing 45, via the duct, in blue wash, on the edge of the left section. According to the plan in drawing 45, this duct would lead to the north wall flues.
Drawing 47 depicts the chimney piece and accompanying flues built at the north end of the Bank Stock Office, as well as a locked, grated entrance into the cellar below. The flues connected to the hypocaust system depicted in drawing 45, conducting hot air and smoke generated by the firebox in the centre of the cellar, as seen in drawing 46, up through the north wall and out of the building. Drawing 22 clearly shows the chimney piece and cellar door in relation to the built hall.
It also appears that the hot air pipes embedded in the north wall and running exposed across the front of the chimney piece might have helped warm the hall. Additionally or alternatively, the chimney piece may have been a working fireplace, holding a bed of hot coals in a raised grate.

(46) A.T. Bolton, The Works of Sir John Soane, 1924, p. 64; (46-47) T. Willmert, 'Heating methods and their impact on Soane's work: Lincoln's Inn Fields and Dulwich Picture Gallery', Journal of Society of Architectural Historians, 52/1, March 1993, (46) pp. 31-32, fig. 6; (47) p. 32, fig. 8

Drawing

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