Arthur Conan Doyle 
Memoirs of Sherlock Holmes [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Nor have I. But the telegraph posts upon this line are sixty yards apart, and the calculation is a simple one. I presume that you have already looked into this matter of the murder of john Straker and the disappearance of Silver Blaze?