Ainsworth Patents

Bausch & Lomb Patents

Blattner & Adam Patents

D. W. Brunton Patents

The first pocket transit.

Buff & Buff Patents

William A. Burt Patents

This section has the solar compass.

C. L. Berger & Sons Patents

Adolph Frese Patents

Gardam Patents

Very important improvement for how the horizontal circle is centered on transits.  This method has been used for many years.

W. & L. E. Gurley Patents

Important patents such as the Solar transit.

Keuffel & Esser Patents

Important improvements to the transit.

A. Lietz Company Patents

John Locke Patents

The first hand level.

T. F. Randolph Patents

George Saegmuller Patents

Improvements to the solar transit is just one of his patents.

J.C. Sala Patents

William Schmolz Patents

Francis Whiteley Patents

William Young - Young & Sons Patents

We Will Be Adding More Materials In The Future!