Wiring, allowable sizes

Pyrex test-tubes fitted with corks or rubber stoppers and labelled with particulars of the size of drop delivered. It must be pointed out that new smooth platinum wire allows liquids to drop off too readily, and hence it is essential to roughen it by dipping into chloroplatinic acid solution, followed by heating to glowing in a flame this should be repeated several times. Micro burettes sometimes find application for the delivery of drops. 

Castables can be modifieci by a clay addition to keep the mass intact, thus allowing apphcation by air-pressure gunning (gunite). Depending upon the size and geometry of the equipment, many castable hnings must be reinforced wire and expanded metal are commonly used. 

Solve for the highest input average input eurrent that oeeurs at the lowest speeified input voltage. This value allows the designer to determine the size of the wire used in the primary winding of the transformer or induetor. 

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