It is our opinion that a patent cannotbe obtained for your process of silverizingglass. The meth od of applying silver leaf to glass through the agency of gum size and a varnish is well known. Silver leaf is oftentimes applied to glass by sizing and a back ing of varnish put on to prevent moisture acting on it also to prevent it f rom being easily rubbed off. The sam ples which you have sent are very good. The common way of silvering glass reflectors—concave and convex—is by the agency of mercury on which it is made to adhere to the glass by excluding all the air. This process is un healthy
It is our opinion that a patent cannotbe obtained for your process of silverizingglass. The meth od of applying silver leaf to glass through the agency of gum size and a varnish is well known. Silver leaf is oftentimes applied to glass by sizing and a back ing of varnish put on to prevent moisture acting on it also to prevent it f rom being easily rubbed off. The sam ples which you have sent are very good. The common way of silvering glass reflectors—concave and convex—is by the agency of mercury on which it is made to adhere to the glass by excluding all the air. This process is un healthy but it is very perfect for the purpose. The coat ing on the back of the silver leaf with paint instead of varnish would not be considered a patentable feature. J. W. If of BarkersvilleIt appears to us that your mandrel for turning out tapering pieces contains some novelty although you cannot expect to cover broad ground in the claim. We do not know of any one who would be likely to become interested in it. Cannot you find some one in your own neighborhood who would lend you some assistance in bringing it out. This we suggest as the best course for you-to pursue. N. P. of ArgusvilleSaladee's Coachmakers Maga zine is published at Columbus Ohio. S. W. of N. YWe cannot inform you as to the frog market. You can find out when you come to the city. P. S. of VaPlacing a grinding stone on a horizontal axis and combining it with a concave stone below so as to grind the grain when introduced between the two stones is not new or patentable. C. A. of Ma—Your title of Professor of Perpetual Mo tions will be truly earned whenever you get one of your self-motors in operation. The correspondent you name had a contrivance for making water lift itself. He said it was sure to work and wouldn't take 'no' from anybody ; so we told him to proceed. We say the same to you. Within the last few months we have illustrated one or two perpetual motions by engraving. What a glorious time it will be when
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