. Railroad structures and estimates . at S40 per horsepower 400 00 Maintenance, repairs, and depreciation Labor, one man at S2 per day (see note) 730. 00 Ammonia per annum ...... 30. 00 Water rates 35. 00 Note. — One man can run an ordinary 35 horsepower plant and also assist in the shop orstores at other work. Less than 30% of his time is taken up with the cold storage plant. Natural Ice Plant. — Approximate cost of installation andoperation. Increased height of building for ice storage with air ducts, drainage, lifts, and insulation, S4800 at 6% per annum. $ 3 tons of ic
. Railroad structures and estimates . at S40 per horsepower 400 00 Maintenance, repairs, and depreciation Labor, one man at S2 per day (see note) 730. 00 Ammonia per annum ...... 30. 00 Water rates 35. 00 Note. — One man can run an ordinary 35 horsepower plant and also assist in the shop orstores at other work. Less than 30% of his time is taken up with the cold storage plant. Natural Ice Plant. — Approximate cost of installation andoperation. Increased height of building for ice storage with air ducts, drainage, lifts, and insulation, S4800 at 6% per annum. $ 3 tons of ice per day at 82 per ton Labor, one man at per day From the above it will be noted that the cold air plant, besideskeeping the supplies in better condition, is a good deal less costlythan buying ice at the price quoted. Construction. — For cold storage buildings the construction isabout as follows: COLD STORAGE. 417 Ceilins Floor Floor ELEVATION Filler out of 4x 6° ^LandJravelRoof 2-2x62x 6°Stud8. ] L EngineRoom ColdStorage ColdStorage ColdStorage Corridor ^ Cold Storage Cold Storage PLANFig. 201. Cold Storage House. 418 NATURAL ICE PLANT. Rubble or concrete foundation walls taken below frost, 24 , with. 12-in. footing course. Outer Walls, Frame Buildings. — Beginning on the outer face,two layers of 1-in. matched sheathing, with insulating paperbetween, 2 X 6 studs at 16-in. centers, two layers 1-in. sheath-ing, with insulating paper between, 2 X 4 studs 16-in. cen-ters, with 1-in. matched sheathing, 2 X 2 studs 16-in. centers,vAih. two layers of 1-in. sheathing and insulating paper between;^\ith this arrangement the walls are about 20 in. thick. Allspaces are filled with mill shavings. Ground Floor. — X bed of gravel at least 12 in. thick, with3 X 3 sills on top, at 18-in. centers, covered with 1-in. matchedsheathing, and 1 X 2 scanthng on top, and two layers of2 X 4 matched flooring over, laid flat ^\ith insulating paperbetween
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