If any interest in or claim to real or personal property be given by sale or gift inter vivos or by will to one, with a limitation over either by way of remainder or of executory devise or any other limitation, and by the same conveyance or will there be conferred, expressly or by implication, a power upon the first taker in his lifetime or by will to use or dispose absolutely of such property, the limitation over shall not fail or be defeated except to the extent that the first taker shall have lawfully exercised such power of disposal. The proceeds of a disposal under such power shall be held subject to the same limitations and the same power of use or disposal as the original property, unless a contrary intent shall appear from the conveyance or will: Provided, however, That a trust deed or mortgage executed by such first taker shall not be construed to be an absolute disposal of the estate thereby conveyed unless there be a sale thereunder, but shall be effective only to the extent of the lien or encumbrance created by such trust deed or mortgage.