Here's what we can glean from historical context:
* Sindhi language and script development: The Sindhi language and alphabet have a long history. The Sindhi alphabet is a variant of the Perso-Arabic script and has been used for centuries.
* Colonial influence: During the British Raj, there was a focus on standardizing and documenting Indian languages, including Sindhi.
* Linguistic scholars and institutions: Several scholars and institutions might have been working on Sindhi language and script analysis during the late 19th and early 20th centuries.
* Early publications: It's possible that academic journals, textbooks, or linguistic studies published around 1900 would have included descriptions of the Sindhi alphabet.
To find a more specific answer, you would need to:
1. Consult linguistic and historical archives: Research libraries, archives, and online databases focusing on Indian languages and history.
2. Search for publications: Look for academic journals, textbooks, or linguistic studies published around 1900 that specifically deal with the Sindhi alphabet.
3. Research biographies of Sindhi scholars: Examine the work of Sindhi language experts from that period.
By combining these research methods, you might be able to pinpoint a specific individual or group responsible for describing the Sindhi alphabet in 1900.