The statement seems extremely peculiar after paying tribute to Felt as the pioneer in the Art of adding machines. One would suppose that having knowledge enough of the Art to offer such tribute would have left them better advised on the subject of visible recording. [Illustration: Two Pages from Booklet Issued by Wales Adding Machine Co.] [Sidenote: _Error key_] The first of the later improvements in the key-set crank-operated recorder were made by Burroughs and consisted of the features which formed a part of Burroughs patent No. 504,963 of 1893. One of these features consisted of means provided in the shape of a special key that when depressed would clear the key-setting, thus allowing of an erroneous key-setting to be corrected by clearing and resetting the correct item. [Sidenote: _Sub-total_] Another feature was provision for printing a total at any time without clearing the machine, thus allowing printing of what may be called a sub-total, while the grand total is carried on to be printed later. [Sidenote: _Repeat key_] The third feature consisted of means for repeated addition and recording of the same item. The means provided consisted of a key, which, if depressed after setting an item on the keys, would prevent the keys from being cleared; thus by repeated operation of the hand-crank the item set up would be printed and added repeatedly. [Sidenote: _Locked keyboard_] The next feature was one of construction, as it was designed to overcome the possibility of the setting of two keys in the same order, by locking all the other keys in that order. The invention was shown applied to the Burroughs machine, but was applied for by Wm. H. Pike Jr., and was issued January 13, 1898. [Sidenote: _Quick paper return_] In 1900 Felt perfected a quick paper return for his wide paper-carriage and applied for a patent, which was issued March 11, 1902, the number of which is 694,955. The feature was, that by operating a lever, it served to return the paper after recording a column of items and automatically shifted the carriage ready for the recording of another column of items, thus facilitating speedy operation. [Sidenote: _Paper stop_] In March, 1902, a patent was allowed Felt on means to lock the mechanism in a recorder when the paper was about to run out of the rolls; a feature which, in tabulating, served as a check against the paper running out of the rolls and prevented further operation until the paper was shifted to commence a new column of items, thus insuring the printing of each record on the paper which formerly depended upon the vigilance of the operator. [Sidenote: _Cross tabulating_]