The story starts with Howard Grubb, a son born into an already-prominent telescope family. Under the name of the Grubb Telescope Company, Howard went on to build refractor telescopes for a number of observatories across Europe, powered by his family’s electrically driven clock drives. In 1900, Howard premiered his latest invention - a reflective sight for small arms.
The first usable spider silk reticles were invented in either 1639, 1662, 1755, (a little before) 1785, or in 1802, each with their own unique spin. Considering that Rittenhouse and Peale’s 1776 “Riffle with a Tellescope to it” was the first recorded scoped rifle shot… and that this is a rifle scope blog... it’s reasonable that Rittenhouse would get credit for the first ‘practical’ application of a spider silk reticle.