I thought all beekeepers knew that the bees hang the nectar drop on the roof of the cell. Further, a larger quantity of nectar is held in by capillary attraction. WHen you hold a comb horizontally the nectar does not run out! You have to give it a light shake. We shake the comb lightly to see if it contains fresh nectar. Honey won't shake out of course, that's why you need a honey extractor.  None of this has to do with the angle of the cells. You will have to look elsewhere for an explanation of the cell angle. 

> Instead of depositing the entire load in a single cell, the house-bee often distributes a load of such nectar by attaching a small hanging drop to the roof of each of several cells as shown in three of the cells in Plate 2, C. The hanging drop exposes a maximum surface for evaporation. Later, these droplets are collected and it is assumed that they are then put through the ripening process.-- PARK, WALLACE (1925) The Storing and Ripening of Honey by Honeybees. Journal of Economic Entomology, Volume 18, Number 2

Pete

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