33 
HOT-WATER APPARATUS. 
The apparatus figured below is the result of some experiments on one which 
was described in our Number for June 1836, and will be found worthy of adoption 
wherever hot water is to be applied on a moderate scale, especially for pits, and 
to maintain an uniform temperature in small stoves. The former apparatus proved 
too irregular in its action to answer satisfactorily the purpose for which it was 
intended ; though, by attaching it to a sufficient length of pipe, and employing a 
small cistern instead of a funnel, it may be made tolerably efficient. 
The superiority, however, of the plan now proposed is too apparent to require 
any comment ; it has stood the test of some months' trial, and has been adopted in 
more instances than one with complete success. 
The subjoined figures will explain the form of the apparatus, and mode of 
Fig. 1 represents the boiler ; a double cone of tin, or copper, in shape nearly 
resembling a sugar-loaf with the top cut off. The inner cone is the furnace, the 
space between that and the outer forms the boiler ; so that a thin shell of water, 
about 1 inch or 1| inch in thickness, surrounds the fire ; a and h are two pipes 
fitted with union joints which communicate with the boiler at the top and bottom ; 
and V is a small steam-pipe connected with a valve. 
Fig. 2 is the chimney detached from the furnace, fitting on to it like the lid 
VOL. IV. NO. XXXVIII. F 
