I cannot parse the last word of this line about Johann Georg Burkhardt.
Can anyone help with his profession?
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After reading up a bit on tanning techniques, I am fairly confident the word in question is Weißgerbers, i.e. the genitive case of Weißgerber. This term denotes a tanner (Gerber) operating with mineral salts, it seems primarily aluminum salts, in order to produce leather of higher quality and lighter color (weiß = white) than more common tanning techniques.
Addendum: The corresponding English word seems to be tawer, the technique itself is called tawing.