GELATINE 



627 



apparatus. When the gelatine is to be used as an alimentary article, the bones 

 ought to be quite fresh, well preserved in brine, or to be dried strongly by a stove. 

 Bones are best crushed by passing them between grooved iron rolls. Tha cast- 

 iron cylinders in which they are to be steamed should be three times greater in 

 length than in diameter. To obtain 1,000 rations of gelatinous soup daily, a charge 

 of four cylinders is required ; each being 3 feet long, by 14 inches wide, capable of 

 holding 70 Ibs. of bones. These will yield each hour about 20 gallons of a strong 

 jelly, and will require nearly 1 gallon of water in the form of steam, and 5 gallons 

 of water to be passed through them in the liquid state. The 5 quarts of jelly pro- 

 duced hourly by each cylinder proceeds from the 1 quart of steam-water and 4 quarts of 

 percolating water. 



The boiler should furnish steam of about 223 Fahr., at a pressure of about 4 Ibs. 

 on the square inch. 



In /^.1082 A, B, c, D, represent a vertical section of the cylinder; o, H, i, K, a 

 section of the basket or cage, aa 



filled with the bruised bones, Mitt 



inclosed in the cylinder ; E, c, c, 

 the pipe which conducts the 

 steam down to the bottom of the 

 cylinder ; L, s, a pipe for intro- 

 ducing water into the interior; 

 M, a stopcock for regulating the 

 quantity of water (according to 

 the force of the steam-pressure 

 within the apparatus), which 

 should be 3 quarts per hour ; 

 N is a tube of tin plate fitting 

 tightly into the part s of the 

 pipe L ; it is shut at R, and per- 

 forated below with a hole ; it 

 is inserted in its place, after the 

 cage-full of bones has been in- 

 troduced. Fig. 1083 is an ele- 

 vation of the apparatus. A, B, 

 c, D, represent the four cylin- 

 ders, raised about 20 inches 

 above the floor, and fixed in their 

 seats by screws ; h h, are the 

 lids ; g g, tubulures or valves in 

 the lids ; t, ring junction of the lid ; p, a thermometer ; / /, stopcocks for drawing 



; 1083 



off the jelly ; n n, small gutters of tin-plate ; m, th 

 into the cistern b ; o, a block and tackle for hoisting th 



ss2 



the general 



gutter of discharge 

 of bones in and <rot. 



