. Electric railway journal . Junk 10, 1911. j ELECTRIC RAILWAY JOURNAL. 1029 NEW LIGHTING TRANSFORMERS. Lighting Transformer In the new line of lighting transformers which the Allis-Chalmers Company is now placing on the market three coolingsurfaces are provided instead of the single surface in theordinary plain case is accomplished hy en-circling the main case with ajacket and providing for thecirculation of oil between thetwo. Both the tank and thejacket are made of boiler are connected at top andbottom by short tubes, leavingan air space between the . join
. Electric railway journal . Junk 10, 1911. j ELECTRIC RAILWAY JOURNAL. 1029 NEW LIGHTING TRANSFORMERS. Lighting Transformer In the new line of lighting transformers which the Allis-Chalmers Company is now placing on the market three coolingsurfaces are provided instead of the single surface in theordinary plain case is accomplished hy en-circling the main case with ajacket and providing for thecirculation of oil between thetwo. Both the tank and thejacket are made of boiler are connected at top andbottom by short tubes, leavingan air space between the . joints are welded, makingboth the tank and jacket seam-less, and absolutely preventingthe chance of leakage. In addi-tion to the three radiating sur-faces provided, the space be-tween the jacket and the tankforms a flue which causes cur-rents of air to ascend at a con-siderable velocity, thereby exerting a scrubbing action on thesurface which greatly facilitates heat dissipation. This styleof tank is used on all lighting transformers of from 20 kva to50 kva capacity inclusive. The tubes connecting the
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