 In addition to being constructed differently from the transmitter described and pictured in Gray's caveat, Bell's working liquid transmitter of March 10, 1876 operated in a way that is in fact described in Bell's original patent application, but not in Gray's caveat.Gray supporters cite the fact that Bell's first successful experiment in transmitting clear speech over a wire was on March 10, 1876 using the same water transmitter design described in Gray's caveat but not described in Bell's patent.A book by Evenson, concludes that it was Bell's lawyers, not Bell, who misappropriated Gray's water transmitter (variable resistance) invention.