Let's get Mathematical Part 4

Calculate the power reserve of the watch described yesterday.

Ratio of Barrel: Centre wheel

N1 x Z1
N2 Z2

Revolutions of Barrel x No. of Barrel teeth
Revolutions of Centre Wheel No. of leaves Centre Pinion

7 x 120
1 12
7 x 10
1 1

=

70
1

=

70