Costs range between $700 for the non-digital Queen **c2** model to nearly $5,000 for the top of the line i10 model mattress.

A C1 crampon is designed for very basic hiking while **C2** is suitable for moderate skill-level mountaineering.

For example, if you have a B2 boot, you could use a **C2** or C1 crampon.

Crampons are marked with grades C1, **C2** and C3.

Hence the note produced with any given circle of holes rises in pitch as the disk revolves more rapidly; and if, the revolution of the disk being kept as steady as possible, the tube be passed rapidly across the circles of the first series, a series of notes is heard, which, if the lowest be denoted by C, form the sequence C, C1, El, G1, **C2**, &c. In like manner, the first circle in which we have two sets of holes dividing the circumference, the one into say 8 parts, and the other into Io,.

(16) Along the path of a liquid particle 4)' is constant, and putting it equal to 2Uc2, (r 2 - a 3 /r) sin 2 0 = c 2, sin 2 0 = **c2r**/(r3 - a3), (17) the polar equation; or y 2 = c2r3/(r3 - a 3), r3 = a3y2 /(y2._ **c2**), (18) a curve of the 10th degree (C10).

U=cv~-+-a To apply this to involute teeth, let ci be the length of the approach, **c2** that of the recess, u1, the mean volocity of sliding during the approach, u2 that during the recess; then civil i\ c,v/1 I

The effective angular inertia of the body in the medium is now required; denote it by C 1 about the axis of the figure, and by **C2** about a diameter of the mean section.

Let v be the common velocity of the two pitch-circles, ri, **C2**, their radii; then the above equation becomes /1 I

A 41311 (56C 1 - 28C 2 + 8C 3 - C4) C1+2(Ci - **C2**) - (**C2** - C3) + s i s(C3 - C4).