Both Uses of

dispose

in

The Scarlet Pimpernel

You have other means at your disposal; you must use them, my friend.
Chpt 8

disposal = command

Then she had changed her muslin frock for a dark traveling costume and mantle, had provided herself with money—which her husband's lavishness always placed fully at her disposal—and had started on her way.
Chpt 20 *

Definitions:

(1) (dispose as in: dispose of the waste)
to throw away
(2) (dispose as in: dispose of the matter)
to settle something so it no longer requires attention
(3) (dispose as in: dispose of the assets)
sell or transfer to another
(4) (dispose as in: disposed the troops along...)
the arrangement, positioning, or use of things
This sense of dispose can be used in the form disposal to indicate that a person can use something as they wish -- as in:
- I am at your disposal.
- She has many assets at her disposal.
(5) (dispose as in: Is she disposed to help?)
inclined (with a tendency to; or in the mood to)

This is usually seen in the form "disposed to..." or "disposed toward..."