American Batter Factories. 
23 
F!g^ li— Millar's Circulating Coil-heater for Factory Milk-vat 
(consisting of coil of gas-pipe enclosed in hricl ). 
Fig. 15. — Factory Milk-vat with Heater beneath. 
V, 
The next engraving (Fig. 16) rrepresents the tin or inner vat 
raised, and the sides of the outer vat broken out to show the 
heater ; and the supports of the inner vat. 
The outer vat is lined with galvanized sheet-iron ; B is the 
inner tin vat; C the copper vat heater, extending the entire length 
of the vat, and surrounded by water in a semi-cylindrical jacket 
open at the top, which water also fills the space between the vats. 
D is the tank or reservoir for hot water, separate from that be- 
tween the vats, and E the copper heater for tank or reservoir. 
F smoke-pipe for both vat and tank heaters. The numbers 
indicate the following parts : — 1, faucet connecting water-space 
between the vats with tank. 2, water-gate in outside vat. 3, 
water-gate in tank. 4, tube through which the whey is drawn from 
the strainer inside the inner vat. The strainer and whey faucet 
are not shown in the engraving. 
