A tee-square with brass blade and steel head (as Vol V Fig. 49), signed Holtzapffel & Deyerlein London; a similar device with protractor head (as Vol V Fig 48), signed Holtzapffel & Co., London; a small turner's square (as Vol IV Fig 426), signed Holtzapffel & Deyerlein, London; a protractor (as Vol IV Fig 376), signed Holtzapffel & Co., London; and 11 steel curvilinear templates by Holtzapffel and others (15)

细节

A tee-square with brass blade and steel head (as Vol V Fig. 49), signed Holtzapffel & Deyerlein London; a similar device with protractor head (as Vol V Fig 48), signed Holtzapffel & Co., London; a small turner's square (as Vol IV Fig 426), signed Holtzapffel & Deyerlein, London; a protractor (as Vol IV Fig 376), signed Holtzapffel & Co., London; and 11 steel curvilinear templates by Holtzapffel and others (15)

拍品专文

It seems to be not generally known that the purpose of the tee and protractor squares is for the 9/16in. wide brass blade to be inserted into the tool box of the O/T slide rest so as to set the slide rest by reference to a previously turned surface. The description in Vol V seems unclear to many.