262 MADRAS FISHERIES BULLETIN VOL. XIII, 



fluctuate; there must be no chance of scorching the lacquer or 

 melting the solder, and any fumes must be allowed to escape. In 

 this country gas is usually out of the question ; superheated steam 

 entirely so ; either a (wood) fire or the sun must do the work. 



A suitable stove is a rectangular chamber of sheet iron, A, set 

 in a somewhat larger masonry chamber, B, in such way that the 

 hot flue gases from the furnace, D, pass through K round every 

 part of A into the chimney C. The heating chamber A may be of 

 any convenient size, with iron battens, E, fixed as ledges on two 

 (or three) sides, and, for heating small cans, about 6 or 7 inches 

 apart vertically; these battens support trays on which the cans are 

 placed. The fourth side has a large iron (double) door, F, fitting 

 closely and provided with a peep-hole G, usually a vertical 

 rectangular slit with a slide ; through G, a thermometer H, which 

 must mark up to 400° F., may be inspected. F also has a larger 

 rectangular orifice, I, near the bottom of the door, and fitted with a 

 slide so that air may be admitted if need be, to cool the chamber 

 or to cause a gentle draught for the removal of any fumes through 

 the orifice J at the top of the chamber. A is heated by a furnace D 

 which should be placed at the side of the masonry chamber B apart 

 from A, so that the heat of the furnace may not be communicated 

 direct to A as it would be if directly below it, but only indirectly 

 by the flue K and its continuation K-l, K-2, K-3 round the sides of 

 A. The exit J for fumes at the top of A may be led into the side 

 of the chimney C or direct by a short pipe into the open air. A 

 stove of this character has long been in use at the Fish Cannery, 

 Chaliyam, but the furnace D is wrongly placed in that stove; it 

 was intended to remodel this stove so as to serve various purposes. 

 The accompanying sketch is rough, and not to scale, and is merely 

 suggestive ; only a vertical section is given. 



9. Solar ovcii. — This is the subject of a separate Note. Such an 

 oven is in actual use at Chaliyam, and supplies the required 

 temperature on any sunny day, but will not work on cloudy days. 

 It is at present only a successful experiment, but the lacquered cans 

 at Chaliyam have mostly been stoved in this oven, and the heat 

 costs nothing and cannot be excessive. 



10. Point 4— Methods and prccaiiiio/is. — The first point to be 

 observed is that the cans must be thoroughly cleaned ; the varnish 

 adheres better — and this is essential — when the cans are thoroughly 

 free from grease or dirt. The cans should be well washed in 



