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The proce dure used followed TM-228, A review of the data leads to the following observationsj- 1, There is definite batch to batch variation, 2, Insofar as the bases are concerned, 33-677 has the poorest whereas 33-697 has the best settling characteristics. 3The single pignent enamels show the 94-697 to have the poorest and 94-677 to have the beat settling waracteristlos.

The exact equivalent length of the various fittings cannot now be determined since the pipe sizes of the building main, riser, and branch leading to the'highest fixture are not known as yet, but a first approximation is necessary in order to make a tentative selection of pipe sizes.

Heating Unit, Electric: A structure containing one or more heating elements, electrical terminals or leads, electric insulation, and a frame or casing, all assembled together in one unit.

These cycles and other factors lead to a periodic variation in the instantaneous rate of heat flow into the weather surface, and a related periodic variation in the rate of heat flow into the air conditioned space.

This one consideration alone has been a great factor leading to economy in construction and design.

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. -- 115 54 -- pipe sizes of the building main, riser, and branch leading to the highest fixture are not known as yet, but a first approximation is necessary in order to make a tentative selection of pipe sizes.

Typical Arrangements op Return-Air Duct Systems Design of Extended Plenum Systems The extended plenum system of gravity warm air heating employs horizontal ducts in the basement leading from an enlargement or extension of the customary plenum to the risers which distribute the conditioned air to the various rooms. .

This one consideration alone, has been a great factor leading to economy in construction and design.

However, it has been found that copper chloride, lead chloride, tin chloride, zinc chloride, common salt and some other salts are partially effective m 21 Domestic Gas Range Research {American Gas Association Laboratories Bulletin 7, p. 64).

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Provision must be made to prevent water from freezing in the tank, the tank .vent, and the pipe leading: to the tank.

Previous to retirement, my guides ere (Ac Bibte and Powca magaiine, the leading megatine in my special trade, through which I attained to the head of the Mechanical Specifications Section in the Bureau of Yards and Docks, My work on eorlA is nearly done.

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