Drawing. Horizontal gas retorts / RT Roussel, nd.

Drawing. Horizontal gas retorts / RT Roussel, nd. [London?, c1930?]. Charcoal; 39x37cm adhered on board, 43x40cm. Signed by artist, br. Depicts three workers on a track wheeled gantry with ladder access, two are cleaning a long line of five rows of gas retorts, the third to left is operating the platform and coal line, on a balcony above left is a railed wagonway with three coal wagons, an arched window roof recedes into the distance