The hardness of the lathe bed material is measured by the

ANS:A - shore sceleroscope.

I believe there's a typographical error in your question. It seems you're referring to the Shore scleroscope. The Shore scleroscope is an instrument used to measure the hardness of metals. It operates on the principle of rebound hardness testing, where a diamond-tipped hammer is dropped from a fixed height onto the surface of the metal specimen. The height of the rebound is then measured, which is proportional to the hardness of the material. The Shore scleroscope provides a quick and non-destructive method for estimating the hardness of metallic materials, particularly in situations where conventional hardness testing methods are impractical. It's often used in industries such as manufacturing, construction, and engineering for quality control purposes.