Dragon Age Legends Effect of Production Boosts Information by markov80
Basically each gear is an extra 10% of the base value(2/3/5), but getting the rounding right makes it a bit more complex
The formula FLOOR((gears + 10.5) * n) matches the data for 1 thru 19 gears, where n = 0.2 for small batch, 0.3 for medium batch, and 0.5 for large batch. FLOOR means round down.
Overall it makes production boosts look more appealing than happiness boosts.
Edited to add 20 gears from thread
Edited: I just thought to look at the actual code. The formula above is equivalent to the one used in the code, except they use 10.4 instead of 10.5 as the constant. However due to the rounding that difference that has no effect on any values.
Edited: Adding link to similar data on happiness
Dragon Age Legends Happiness Effects Guide
Normal furnaces (and taverns) affect only horizontally or vertically touching rooms. The crown upgrade to these rooms increases the distance to 2 squares of ?taxicab? distance ? meaning add the horizontal and vertical distances.
For a normal furnace (the F below), you only get bonuses on the squares marked 1, with the crown upgrade you also get the bonus on the squares marked 2.
Tavern is the same just wider since the room is wider