B65-566 INCLINOMETER. Deck Patent. The inclinometers patented by Thomas Deck of Toledo and manufactured by Deck's Gravity Level Co. have an unusually elaborate balancing mechanism to support the needle that tends to make it very sensitive but not very practical. Most examples are based on Deck's second, 1905, patent, with a brass dial (See Lot 572). This is a very rare example of the first version, based on Deck's 1896 patent, with a paper dial and simpler mechanism. Also features a medallion on the reverse side with the patent information. 24". You'll find dozens of Type 2 Decks for each one of these. 24" cherry stock, very clean, good original paper dial, needle tends to bind up which is typical of Decks, but not frozen. From the collection of David Jeffers. Good+ 600-1200