![\"mod11blog001\"](\"http:\/\/industrialglenn.com\/tools\/wp-content\/uploads\/2009\/01\/mod11blog001.jpg\" "\\"mod11blog001\\"")
<\/a><\/p>\nNext is from 1929. Notice the area around the anvil has been slimmed down and there’s\u00a0 no lock screw. That’s because this later model has an adjustable thimble ( patent number 1,629,406 )
\nNotice also that the mic is marked 11 instead of Rex.<\/p>\n
Here’s my only Rex.<\/p>\n It too has the adjustable thimble but this is probably a replacement since its also equipped with the adjustable anvil.\u00a0 Notice also the thimble has been finished in hard chrome or “dull chrome” as it was originally called. It makes the mic easier to read and better resists scratches and rust than plain steel. This finish, also applied to the barrel has been polished off the end cap. The other markings on the frame\u00a0read “Pat Pending” and\u00a0 “2d Quality”.<\/p>\n I don’t know exactly when, but between 1929 and 1935\u00a0 the frame of the No. 11 was changed.<\/p>\n (below).<\/p>\n Both mics pictured are missing the original black enamel finish on their frames. I repainted one using auto touch up paint in a spray can. (above) \u00a0It seems to be the most durable of all\u00a0 spray paints available to the general consumer. I’ve purchased spray cans of so called industrial enamels at Home Despot and found them to be no better than standard spray enamels.<\/p>\n Both originally had ratchet stops but one is missing . It looks like it was torn off and then the jagged edges hammered down. (below) What a thing to do to a precision tool.<\/p>\n When the spindles are drawn all the way out another more important difference becomes apparent. Inside the barrel of the mic is a partially split nut through which the spindle passes. \u00a0 Over time play will develop between this nut and the spindle and accuracy is affected.<\/p>\n Another nut <\/p>\n , screwed onto the slotted section of the barrel nut will take up this play . Originally the whole arrangement was held in by friction but around 1941 it was changed with the addition of another nut to lock everything in place. \u00a0 (below)<\/p>\n In the early 1950’s Brown & Sharpe began to manufacture micrometers with larger thimbles and dull chrome finish.\u00a0 Here’s a No. 11 made in the mid 50’s. (below) \u00a0It probably didn’t see much use and is in excellent condition.<\/p>\n Notice every graduation on the thimble is numbered as opposed to every 5th graduation like on the earlier made mics. Also <\/p>\n , the frame is painted in wrinkle finish enamel, not smooth.<\/p>\n The barrel nut arrangement was improved upon again. This included simplifying things so that one nut could lock the barrel nut and adjust for wear. (below)<\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n